#include <iostream>
#include <vector>
#include <algorithm>
#include <cmath>
#include <queue>
#include <string>
#include <map>
#include <set>
#include <stack>
#include <tuple>
#include <deque>
#include <array>
#include <numeric>
#include <bitset>
#include <iomanip>
#include <cassert>
#include <chrono>
#include <random>
#include <limits>
#include <iterator>
#include <functional>
#include <sstream>
#include <fstream>
#include <complex>
#include <cstring>
#include <unordered_map>
#include <unordered_set>
using namespace std;

using ll = long long;
using P = pair<int, int>;
constexpr int INF = 1001001001;
// constexpr int mod = 1000000007;
constexpr int mod = 998244353;

template<class T>
inline bool chmax(T& x, T y){
    if(x < y){
        x = y;
        return true;
    }
    return false;
}
template<class T>
inline bool chmin(T& x, T y){
    if(x > y){
        x = y;
        return true;
    }
    return false;
}

template<typename T>
struct Edge{
    int to;
    T cost;
    Edge() = default;
    Edge(int to, T cost) : to(to), cost(cost) {}
};

template<typename T>
struct CostLCA{
    using G = vector<vector<Edge<T>>>;

    const int ub_log;
    vector<int> depth;
    vector<T> costs;
    const G& g;
    vector<vector<int>> table;

    CostLCA(const G& g) : g(g), depth(g.size()), costs(g.size()), ub_log(32 - __builtin_clz(g.size())){
        table.assign(ub_log, vector<int>(g.size(), -1));
    }

    void dfs(int from, int par = -1, int dep = 0, T sum = 0){
        table[0][from] = par;
        depth[from] = dep;
        costs[from] = sum;
        for(int i = 0; i < (int)g[from].size(); ++i){
            int to = g[from][i].to;
            T cost = g[from][i].cost;
            if(to != par)   dfs(to, from, dep + 1, sum + cost);
        }
    }

    void build(int root = 0){
        dfs(root);
        for(int k = 0; k + 1 < ub_log; ++k){
            for(int i = 0; i < (int)table[k].size(); ++i){
                if(table[k][i] == -1)   table[k + 1][i] = -1;
                else    table[k + 1][i] = table[k][table[k][i]];
            }
        }
    }

    int query(int u, int v){
        if(depth[u] > depth[v]) swap(u, v);
        
        v = get(v, depth[v] - depth[u]);
        if(u == v)  return u;

        for(int i = ub_log - 1; i >= 0; --i){
            if(table[i][u] != table[i][v]){
                u = table[i][u];
                v = table[i][v];
            }
        }
        return table[0][u];
    }

    int get(int v, int x){
        if(x <= 0)  return v;
        for(int i = ub_log - 1; i >= 0; --i){
            if(x >> i & 1)  v = table[i][v];
        }
        return v;
    }

    int length(int u, int v){
        int lca = query(u, v);
        return depth[u] + depth[v] - depth[lca] * 2;
    }

    T dist(int u, int v){
        int lca = query(u, v);
        return costs[u] + costs[v] - costs[lca] * 2;
    }
};

int main(){
    ios::sync_with_stdio(false);
    cin.tie(nullptr);

    int N, Q;
    cin >> N;
    vector<vector<Edge<int>>> g(N);
    for(int i = 1; i < N; ++i){
        int a, b, c;
        cin >> a >> b >> c;
        --a, --b;
        g[a].emplace_back(b, c);
        g[b].emplace_back(a, c);
    }
    CostLCA<int> lca(g);
    lca.build();
    cin >> Q;
    for(int q = 0; q < Q; ++q){
        int s, t;
        cin >> s >> t;
        --s, --t;
        cout << lca.dist(s, t) << '\n';
    }

    return 0;
}