#include <bits/stdc++.h>
using namespace std;
const int LOG = 18;
int main(){
  int N;
  cin >> N;
  vector<vector<pair<int, int>>> E(N);
  for (int i = 0; i < N - 1; i++){
    int a, b, c;
    cin >> a >> b >> c;
    a--;
    b--;
    E[a].push_back(make_pair(c, b));
    E[b].push_back(make_pair(c, a));
  }
  vector<int> p(N, -1);
  vector<vector<int>> c(N);
  vector<int> d1(N, 0);
  vector<int> d2(N, 0);
  queue<int> q;
  q.push(0);
  while (!q.empty()){
    int v = q.front();
    q.pop();
    for (auto P : E[v]){
      int w = P.second;
      if (w != p[v]){
        p[w] = v;
        c[v].push_back(w);
        d1[w] = d1[v] + 1;
        d2[w] = d2[v] + P.first;
        q.push(w);
      }
    }
  }
  vector<vector<int>> pp(LOG, vector<int>(N, -1));
  pp[0] = p;
  for (int i = 0; i < LOG - 1; i++){
    for (int j = 0; j < N; j++){
      if (pp[i][j] != -1){
        pp[i + 1][j] = pp[i][pp[i][j]];
      }
    }
  }
  int Q;
  cin >> Q;
  for (int i = 0; i < Q; i++){
    int s, t;
    cin >> s >> t;
    s--;
    t--;
    int ans = 0;
    if (d1[s] > d1[t]){
      swap(s, t);
    }
    for (int j = 0; j < LOG; j++){
      if (((d1[t] - d1[s]) >> j & 1) == 1){
        ans += d2[t] - d2[pp[j][t]];
        t = pp[j][t];
      }
    }
    if (s != t){
      for (int j = LOG - 1; j >= 0; j--){
        if (pp[j][s] != pp[j][t]){
          ans += d2[s] - d2[pp[j][s]];
          ans += d2[t] - d2[pp[j][t]];
          s = pp[j][s];
          t = pp[j][t];
        }
      }
      ans += d2[s] - d2[p[s]];
      ans += d2[t] - d2[p[t]];
    }
    cout << ans << endl;
  }
}