#include <bits/stdc++.h>
using namespace std;
using ll=long long;
using ull=unsigned long long;
using P=pair<ll,ll>;
template<typename T>using minque=priority_queue<T,vector<T>,greater<T>>;
template<typename T>bool chmax(T &a,const T &b){return (a<b?(a=b,true):false);}
template<typename T>bool chmin(T &a,const T &b){return (a>b?(a=b,true):false);}
template<typename T1,typename T2>istream &operator>>(istream &is,pair<T1,T2>&p){is>>p.first>>p.second;return is;}
template<typename T1,typename T2,typename T3>istream &operator>>(istream &is,tuple<T1,T2,T3>&a){is>>std::get<0>(a)>>std::get<1>(a)>>std::get<2>(a);return is;}
template<typename T,size_t n>istream &operator>>(istream &is,array<T,n>&a){for(auto&i:a)is>>i;return is;}
template<typename T>istream &operator>>(istream &is,vector<T> &a){for(auto &i:a)is>>i;return is;}
template<typename T1,typename T2>void operator++(pair<T1,T2>&a,int n){a.first++,a.second++;}
template<typename T1,typename T2>void operator--(pair<T1,T2>&a,int n){a.first--,a.second--;}
template<typename T>void operator++(vector<T>&a,int n){for(auto &i:a)i++;}
template<typename T>void operator--(vector<T>&a,int n){for(auto &i:a)i--;}
#define overload3(_1,_2,_3,name,...) name
#define rep1(i,n) for(int i=0;i<(int)(n);i++)
#define rep2(i,l,r) for(int i=(int)(l);i<(int)(r);i++)
#define rep(...) overload3(__VA_ARGS__,rep2,rep1)(__VA_ARGS__)
#define reps(i,l,r) rep2(i,l,r)
#define all(x) x.begin(),x.end()
#define pcnt(x) __builtin_popcountll(x)
#define fin(x) return cout<<(x)<<'\n',static_cast<void>(0)
#define yn(x) cout<<((x)?"Yes\n":"No\n")
#define uniq(x) sort(all(x)),x.erase(unique(all(x)),x.end())
template<typename T>
inline int fkey(vector<T>&z,T key){return lower_bound(z.begin(),z.end(),key)-z.begin();}
ll myceil(ll a,ll b){return (a+b-1)/b;}
template<typename T,size_t n,size_t id=0>
auto vec(const int (&d)[n],const T &init=T()){
  if constexpr (id<n)return vector(d[id],vec<T,n,id+1>(d,init));
  else return init;
}
#ifdef LOCAL
#include<debug.h>
#define SWITCH(a,b) (a)
#else
#define debug(...) static_cast<void>(0)
#define debugg(...) static_cast<void>(0)
#define SWITCH(a,b) (b)
template<typename T1,typename T2>ostream &operator<<(ostream &os,const pair<T1,T2>&p){os<<p.first<<' '<<p.second;return os;}
#endif
struct Timer{
  clock_t start;
  Timer(){
    start=clock();
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
    cout<<fixed<<setprecision(16);
  }
  inline double now(){return (double)(clock()-start)/1000;}
  #ifdef LOCAL
  ~Timer(){
    cerr<<"time:";
    cerr<<now();
    cerr<<"ms\n";
  }
  #endif
}timer;
void SOLVE();
int main(){
  int testcase=1;
  //cin>>testcase;
  for(int i=0;i<testcase;i++){
    SOLVE();
  }
}
template<typename T=int>
struct Edge{
  int from,to;
  T weight;
  int index;
  Edge(int from_,int to_,T weight_=T(),int index_=-1):from(from_),to(to_),weight(weight_),index(index_){}
  Edge():from(-1),to(-1),weight(),index(-1){}
  friend std::ostream &operator<<(std::ostream &os,const Edge&e){
    os<<'[';
    os<<"from:"<<e.from;
    os<<"to:"<<e.to;
    os<<"weight:"<<e.weight;
    os<<"index:"<<e.index;
    os<<']';
    return os;
  }
};
template<typename T=int>
struct Tree{
private:
  int n;
  std::vector<int>par;
  std::vector<Edge<T>>edge;
  std::vector<Edge<T>>g;
  std::vector<int>ptr;
  struct tree_range{
    using iterator=typename std::vector<Edge<T>>::iterator;
    iterator l,r;
    iterator begin()const{return l;}
    iterator end()const{return r;}
    int size()const{return r-l;}
    bool empty()const{return !size();}
    Edge<T> &operator[](int i)const{return l[i];}
  };
  struct const_tree_range{
    using iterator=typename std::vector<Edge<T>>::const_iterator;
    iterator l,r;
    iterator begin()const{return l;}
    iterator end()const{return r;}
    int size()const{return r-l;}
    bool empty()const{return !size();}
    const Edge<T> &operator[](int i)const{return l[i];}
  };
public:
  explicit Tree(int n_):n(n_){
    edge.reserve(n-1);
  }
  Tree():n(0){}
  Tree(int n_,const std::vector<Edge<T>>&e,bool dir=false):n(n_),edge(e){
    if(!dir)build();
    else{
      par.resize(n,-1);
      ptr.resize(n+1);
      for(const Edge<T>&i:edge)ptr[i.from]++,par[i.to]=i.from;
      for(int i=1;i<=n;i++)ptr[i]+=ptr[i-1];
      assert(ptr[n]==n-1);
      g.resize(n-1);
      for(const Edge<T>&i:edge)g[--ptr[i.from]]=i;
    }
  }
  template<bool weighted=false,bool index=1>
  void read(){
    for(int i=0;i<n-1;i++){
      int u,v;
      T w=T();
      std::cin>>u>>v;
      if constexpr(index)u--,v--;
      if constexpr(weighted)std::cin>>w;
      else w=1;
      edge.emplace_back(u,v,w,i);
    }
    build();
  }
  template<bool index=1>
  void readp(){
    par.resize(n);
    par[0]=-1;
    ptr.resize(n+1);
    for(int i=1;i<n;i++){
      int p;
      std::cin>>p;
      if constexpr(index)p--;
      edge.emplace_back(p,i,1,i-1);
      par[i]=p;
      ptr[p]++;
    }
    for(int i=1;i<=n;i++)ptr[i]+=ptr[i-1];
    g.resize(n-1);
    for(int i=0;i<n-1;i++){
      g[--ptr[edge[i].from]]=edge[i];
    }
  }
  void add_edge(int u,int v){edge.emplace_back(u,v,1,edge.size());}
  void add_edge(int u,int v,T w){edge.emplace_back(u,v,w,edge.size());}
  void add_edge(int u,int v,T w,int idx){edge.emplace_back(u,v,w,idx);}
  inline bool is_directed()const{return !par.empty();}
  void build(){
    ptr.resize(n+1,0);
    for(auto&&[u,v,w,i]:edge)ptr[u]++,ptr[v]++;
    for(int i=1;i<=n;i++)ptr[i]+=ptr[i-1];
    assert(ptr[n]==n*2-2);
    g.resize(n*2-2);
    par.clear();
    for(auto&&[u,v,w,i]:edge){
      g[--ptr[u]]=Edge(u,v,w,i);
      g[--ptr[v]]=Edge(v,u,w,i);
    }
  }
  void remove_parent(int root=0){
    edge.resize(n-1);
    par.resize(n);
    par[root]=-1;
    std::queue<int>que;
    que.push(root);
    while(!que.empty()){
      int x=que.front();
      que.pop();
      for(const Edge<T>&e:(*this)[x])if(e.to!=par[x]){
        par[e.to]=x;
        edge[e.index]=e;
        que.push(e.to);
      }
    }
    ptr.resize(n+1);
    std::fill(ptr.begin(),ptr.end(),0);
    for(int i=0;i<n-1;i++)ptr[edge[i].from]++;
    for(int i=1;i<=n;i++)ptr[i]+=ptr[i-1];
    g.resize(ptr[n]);
    for(const Edge<T>&e:edge)g[--ptr[e.from]]=e;
  }
  std::vector<int>bfs_order()const{
    assert(is_directed());
    std::vector<int>bfs(n);
    int p=0,q=0;
    bfs[q++]=root();
    while(p<q){
      int x=bfs[p++];
      for(const Edge<T>&e:(*this)[x])bfs[q++]=e.to;
    }
    return bfs;
  }
  std::vector<int>dfs_order()const{
    assert(is_directed());
    std::vector<int>res;
    res.reserve(n);
    std::vector<int>st(n);
    int p=0;
    st[p++]=root();
    while(p){
      int x=st[--p];
      res.push_back(x);
      p+=(*this)[x].size();
      for(const Edge<T>&e:(*this)[x])st[--p]=e.to;
      p+=(*this)[x].size();
    }
    return res;
  }
  std::vector<int>rbfs_order()const{
    std::vector<int>bfs=bfs_order();
    std::reverse(bfs.begin(),bfs.end());
    return bfs;
  }
  void hld(){
    assert(is_directed());
    std::vector<int>sub(n);
    for(int x:rbfs_order()){
      sub[x]=1;
      int mx=-1;
      for(Edge<T>&e:(*this)[x]){
        sub[x]+=sub[e.to];
        if(mx<sub[e.to]){
          mx=sub[e.to];
          std::swap((*this)[x][0],e);
        }
      }
    }
  }
  std::pair<std::vector<int>,std::vector<int>>in_out_order(){
    assert(is_directed());
    std::vector<int>in(n),out(n);
    int p=0;
    auto dfs=[&](auto self,int x)->void {
      in[x]=p++;
      for(const Edge<T>&e:(*this)[x]){
        self(self,e.to);
      }
      out[x]=p;
    };
    dfs(dfs,root());
    return std::make_pair(in,out);
  }
  std::pair<T,std::vector<int>>diameter()const{
    assert(!is_directed());
    static constexpr T inf=std::numeric_limits<T>::max();
    std::vector<T>dst(n,inf);
    dst[0]=0;
    std::vector<int>que(n);
    int p=0,q=1;
    que[0]=0;
    while(p<q){
      int x=que[p++];
      for(const Edge<T>&e:(*this)[x])if(dst[e.to]==inf){
        dst[e.to]=dst[x]+e.weight;
        que[q++]=e.to;
      }
    }
    int u=std::max_element(dst.begin(),dst.end())-dst.begin();
    std::fill(dst.begin(),dst.end(),inf);
    dst[u]=0;
    p=0,q=1;
    que[0]=u;
    while(p<q){
      int x=que[p++];
      for(const Edge<T>&e:(*this)[x])if(dst[e.to]==inf){
        dst[e.to]=dst[x]+e.weight;
        que[q++]=e.to;
      }
    }
    int v=std::max_element(dst.begin(),dst.end())-dst.begin();
    T weight=dst[v];
    std::vector<int>res;
    while(u!=v){
      res.push_back(v);
      for(const Edge<T>&e:(*this)[v])if(dst[e.to]<dst[v]){
        v=e.to;
        break;
      }
    }
    res.push_back(u);
    return std::make_pair(weight,res);
  }
  int size()const{return n;}
  tree_range operator[](int i){return tree_range{g.begin()+ptr[i],g.begin()+ptr[i+1]};}
  const_tree_range operator[](int i)const{return const_tree_range{g.begin()+ptr[i],g.begin()+ptr[i+1]};}
  const Edge<T>& get_edge(int i)const{return edge[i];}
  inline int parent(int i)const{return par[i];}
  inline int root()const{return std::find(par.begin(),par.end(),-1)-par.begin();}
  typename std::vector<Edge<T>>::iterator begin(){return edge.begin();}
  typename std::vector<Edge<T>>::iterator end(){return edge.end();}
  typename std::vector<Edge<T>>::const_iterator begin()const{return edge.begin();}
  typename std::vector<Edge<T>>::const_iterator end()const{return edge.end();}
};
struct StaticTopTree{
  std::vector<int>left,right,par,A,B;
  StaticTopTree(){}
  template<typename T>
  explicit StaticTopTree(Tree<T>t){
    assert(t.is_directed());
    t.hld();
    int n=t.size();
    left.reserve(n*2-1),right.reserve(n*2-1),par.reserve(n*2-1),A.reserve(n*2-1),B.reserve(n*2-1);
    left.resize(n,-1),right.resize(n,-1),par.resize(n,-1),A.resize(n),B.resize(n);
    for(int i=0;i<n;i++){
      A[i]=t.parent(i);
      B[i]=i;
    }
    auto dfs=[&](auto self,int x)->std::pair<int,int> {
      std::vector<std::pair<int,int>>vs{{0,x}};
      while(t[x].size()>=1){
        std::priority_queue<std::pair<int,int>,std::vector<std::pair<int,int>>,std::greater<std::pair<int,int>>>que;
        int heavy=t[x][0].to;
        que.emplace(0,heavy);
        for(int i=1;i<t[x].size();i++)que.push(self(self,t[x][i].to));
        while((int)que.size()>=2){
          auto [d1,v1]=que.top();que.pop();
          auto [d2,v2]=que.top();que.pop();
          if(B[v2]==heavy)std::swap(d1,d2),std::swap(v1,v2);
          int nv=left.size();
          left.push_back(v1),right.push_back(v2),par.push_back(-1),A.push_back(x),B.push_back(B[v1]);
          par[v1]=par[v2]=nv;
          que.emplace(std::max(d1,d2)+1,nv);
        }
        vs.push_back(que.top());
        while(true){
          int sz=vs.size();
          if(sz>=3&&(vs[sz-3].first==vs[sz-2].first||vs[sz-3].first<=vs[sz-1].first)){
            int nv=left.size();
            left.push_back(vs[sz-3].second),right.push_back(vs[sz-2].second),par.push_back(-1),A.push_back(A[vs[sz-3].second]),B.push_back(B[vs[sz-2].second]);
            par[vs[sz-3].second]=par[vs[sz-2].second]=nv;
            vs[sz-3].first=std::max(vs[sz-3].first,vs[sz-2].first)+1;
            vs[sz-3].second=nv;
            vs[sz-2]=vs[sz-1];
            vs.pop_back();
          }
          else if(sz>=2&&vs[sz-2].first<=vs[sz-1].first){
            int nv=left.size();
            left.push_back(vs[sz-2].second),right.push_back(vs[sz-1].second),par.push_back(-1),A.push_back(A[vs[sz-2].second]),B.push_back(B[vs[sz-1].second]);
            par[vs[sz-2].second]=par[vs[sz-1].second]=nv;
            vs[sz-2].first=std::max(vs[sz-2].first,vs[sz-1].first)+1;
            vs[sz-2].second=nv;
            vs.pop_back();
          }
          else break;
        }
        x=heavy;
      }
      while((int)vs.size()>=2){
        int sz=vs.size();
        int nv=left.size();
        left.push_back(vs[sz-2].second),right.push_back(vs[sz-1].second),par.push_back(-1),A.push_back(A[vs[sz-2].second]),B.push_back(B[vs[sz-1].second]);
        par[vs[sz-2].second]=par[vs[sz-1].second]=nv;
        vs[sz-2].first=std::max(vs[sz-2].first,vs[sz-1].first)+1;
        vs[sz-2].second=nv;
        vs.pop_back();
      }
      return vs[0];
    };
    dfs(dfs,t.root());
  }
};
struct ContourQuery{
private:
  StaticTopTree stt;
  std::vector<std::vector<int>>ptr;
  std::vector<std::vector<int>>dst;
  std::vector<std::vector<int>>vs;
  std::vector<int>dep;
  int vsc;
public:
  ContourQuery(){}
  template<typename T>
  ContourQuery(const Tree<T>&t){
    assert(!t.is_directed());
    int n=t.size();
    std::vector<int>parent(n,-1);
    {
      Tree<T>t2(t);
      t2.remove_parent();
      for(int i=1;i<n;i++)parent[i]=t2.parent(i);
      stt=StaticTopTree(std::move(t2));
    }
    dep.resize(n*2-1);
    for(int i=n*2-1;i-->n;){
      dep[stt.left[i]]=dep[stt.right[i]]=dep[i]+1;
    }
    dst.resize(*std::max_element(dep.begin(),dep.end())+1,std::vector<int>(n,-1));
    ptr.resize(n*2-1);
    std::vector<int>que(n);
    int p=0,q=0;
    std::vector<bool>vis(n,false);
    vsc=n;
    vs.resize(n);
    for(int i=0;i<n;i++)vs[i]=std::vector<int>{i};
    std::vector<int>boundaryA_vs;
    auto dfs=[&](auto self,int v)->std::vector<int> {
      if(v<n){
        vis[v]=true;
        return std::vector<int>{v};
      }
      int d=dep[v];
      int lv=stt.left[v],rv=stt.right[v];
      bool boundaryA=false;
      std::vector<int>lch=self(self,lv);
      p=q=0;
      boundaryA_vs.clear();
      for(int x:lch)if(parent[x]==stt.A[lv])boundaryA_vs.push_back(x);
      if(stt.A[lv]==stt.A[rv]){
        for(int x:boundaryA_vs){
          dst[d][x]=1;
          que[q++]=x;
        }
        boundaryA=true;
      }
      else{
        dst[d][stt.B[lv]]=0;
        que[q++]=stt.B[lv];
      }
      ptr[lv].resize(2);
      ptr[lv][0]=vsc;
      while(p<q){
        int x=que[p++];
        if(x<0){
          x=~x;
          for(int y:boundaryA_vs)if(x!=y){
            dst[d][y]=dst[d][x]+2;
            que[q++]=y;
          }
          continue;
        }
        while(std::ssize(ptr[lv])<=dst[d][x]+1)ptr[lv].push_back(0);
        ptr[lv][dst[d][x]+1]++;
        vs[x].push_back(vsc++);
        for(const Edge<T>&e:t[x]){
          if(vis[e.to]&&dst[d][e.to]==-1){
            dst[d][e.to]=dst[d][x]+1;
            que[q++]=e.to;
          }
          else if(!boundaryA&&e.to==stt.A[lv]){
            boundaryA=true;
            que[q++]=~x;
          }
        }
      }
      for(int i=1;i<std::ssize(ptr[lv]);i++)ptr[lv][i]+=ptr[lv][i-1];
      for(int x:lch)vis[x]=false;
      vsc=ptr[lv].back();
      std::vector<int>rch=self(self,rv);
      p=q=0;
      boundaryA_vs.clear();
      for(int x:rch)if(parent[x]==stt.A[rv])boundaryA_vs.push_back(x);
      for(int x:boundaryA_vs){
        dst[d][x]=1;
        que[q++]=x;
      }
      ptr[rv].resize(2);
      ptr[rv][0]=vsc;
      while(p<q){
        int x=que[p++];
        if(std::ssize(ptr[rv])==dst[d][x]+1)ptr[rv].push_back(0);
        ptr[rv][dst[d][x]+1]++;
        vs[x].push_back(vsc++);
        for(const Edge<T>&e:t[x])if(vis[e.to]&&dst[d][e.to]==-1){
          dst[d][e.to]=dst[d][x]+1;
          que[q++]=e.to;
        }
      }
      for(int i=1;i<std::ssize(ptr[rv]);i++)ptr[rv][i]+=ptr[rv][i-1];
      vsc=ptr[rv].back();
      for(int x:lch)vis[x]=true;
      if(std::ssize(lch)<std::ssize(rch))std::swap(lch,rch);
      lch.insert(lch.end(),rch.begin(),rch.end());
      return lch;
    };
    dfs(dfs,n*2-2);
  }
  const std::vector<int>&get_vs(int v)const{return vs[v];}
  std::vector<std::pair<int,int>>get_range(int v,int l,int r)const{
    std::vector<std::pair<int,int>>res;
    if(l<=0&&1<=r)res.emplace_back(v,v+1);
    int x=v;
    while(true){
      int par=stt.par[v];
      if(par==-1)break;
      int another=stt.left[par]^stt.right[par]^v;
      int d=dep[par];
      int rtov=dst[d][x];
      int nl=std::clamp<int>(l-rtov,0,std::ssize(ptr[another])-1);
      int nr=std::clamp<int>(r-rtov,0,std::ssize(ptr[another])-1);
      nl=ptr[another][nl],nr=ptr[another][nr];
      if(nl!=nr){
        res.emplace_back(nl,nr);
      }
      v=par;
    }
    return res;
  }
  inline int size()const{return vsc;}
};
#include<type_traits>
#include<concepts>
template<typename T>
constexpr std::enable_if_t<std::numeric_limits<T>::digits<=32,int>msb(T n){return n==0?-1:31-__builtin_clz(n);}
template<typename T>
constexpr std::enable_if_t<(std::numeric_limits<T>::digits>32),int>msb(T n){return n==0?-1:63-__builtin_clzll(n);}

template<typename T>
constexpr std::enable_if_t<std::numeric_limits<T>::digits<=32,int>lsb(T n){return n==0?-1:__builtin_ctz(n);}
template<typename T>
constexpr std::enable_if_t<(std::numeric_limits<T>::digits>32),int>lsb(T n){return n==0?-1:__builtin_ctzll(n);}

template<typename T>
constexpr std::enable_if_t<std::is_integral_v<T>,T>floor_pow2(T n){return n==0?0:T(1)<<msb(n);}

template<typename T>
constexpr std::enable_if_t<std::is_integral_v<T>,T>ceil_pow2(T n){return n<=1?1:T(1)<<(msb(n-1)+1);}

template<std::integral T>
constexpr T safe_div(T a,T b){return a/b-(a%b&&(a^b)<0);}
template<std::integral T>
constexpr T safe_ceil(T a,T b){return a/b+(a%b&&(a^b)>0);}
template<typename M>
struct BinaryIndexedTree{
private:
  using S=typename M::S;
  std::vector<S>dat;
  int z;
public:
  BinaryIndexedTree(){}
  explicit BinaryIndexedTree(int n):z(ceil_pow2(n)),dat(n,M::e()){}
  explicit BinaryIndexedTree(const std::vector<S>&init):z(ceil_pow2((int)init.size())),dat(init){
    for(int i=0;i<(int)dat.size();i++){
      int j=i+((i+1)&-(i+1));
      if(j<(int)dat.size())dat[j]=M::op(dat[i],dat[j]);
    }
  }
  inline void add(int i,S x){
    while(i<(int)dat.size()){
      dat[i]=M::op(dat[i],x);
      i+=(i+1)&-(i+1);
    }
  }
  inline S sum(int i)const{
    S res=M::e();
    while(i>0){
      res+=dat[i-1];
      i-=i&-i;
    }
    return res;
  }
  inline S sum(int l,int r)const{
    S lp=M::e(),rp=M::e();
    while(l<r){
      rp=M::op(dat[r-1],rp);
      r-=r&-r;
    }
    while(r<l){
      lp=M::op(dat[l-1],lp);
      l-=l&-l;
    }
    return M::op(M::inverse(lp),rp);
  }
  int lower_bound(S k)const{
    int res=0;
    for(int i=z;i>=1;i>>=1){
      if(res+i<=(int)dat.size()&&dat[res+i-1]<k){
        k-=dat[res+i-1];
        res+=i;
      }
    }
    return res;
  }
  friend std::ostream &operator<<(std::ostream &os,const BinaryIndexedTree&bit){
    os<<"{";
    for(int i=0;i<(int)bit.dat.size();i++)os<<bit.sum(i,i+1)<<",}"[i+1==(int)bit.dat.size()];
    if(bit.dat.empty())os<<"}";
    return os;
  }
};
template<typename T=int>
struct MonoidAdd{
  using S=T;
  using F=std::nullptr_t;
  static inline S op(S x,S y){return x+y;}
  static inline S e(){return 0;}
  static inline S mapping(F,const S&x,long long){return x;}
  static inline F composition(F,F){return nullptr;}
  static inline F id(){return nullptr;}
  static inline S inverse(S x){return -x;}
  static inline void revS(S&x){}
  static inline S pow(S x,long long p){return x*p;}
};
void SOLVE(){
  int n,q;
  cin>>n>>q;
  Tree t(n);
  t.read();
  ContourQuery cq(t);
  BinaryIndexedTree<MonoidAdd<ll>>BIT(cq.size());
  while(q--){
    int x,y,z;
    cin>>x>>y>>z;
    x--;
    ll ans=0;
    for(const int&v:cq.get_vs(x))ans+=BIT.sum(0,v+1);
    cout<<ans<<'\n';
    for(auto [l,r]:cq.get_range(x,0,y+1)){
      BIT.add(l,z);
      BIT.add(r,-z);
    }
  }
}