#include <bits/stdc++.h>

using namespace std;

#define REP(i,n) for(int i=0; i<(int)(n); i++)

void dfs(int v, int p, int d, long long s,
         vector<int> &par, vector<int> &depth, vector<long long> &sum,
         vector<vector<pair<int, int> > > &edges) {

  par[v] = p;
  depth[v] = d;
  sum[v] = s;

  for (auto &pr: edges[v]) {
    int w, cost;
    tie(w, cost) = pr;
    if (w == p) continue;
    dfs(w, v, d+1, s + cost, par, depth, sum, edges); 
  }
}

int lca(int v, int w, const vector<vector<int> > &par, const vector<int> &depth) {
  if (depth[w] > depth[v])
    swap(v, w);

  for (int i = 0; i < par.size(); i++) {
    int d = depth[v] - depth[w];
    if (d & 1 << i) {
      v = par[i][v];
    }
  }

  if (v == w) return v;

  for (int i = par.size() - 1; i >= 0; i--) {
    if (par[i][v] != par[i][w]) {
      v = par[i][v];
      w = par[i][w];
    }
  }
  return par[0][v];
}

int main() {
  ios_base::sync_with_stdio(0);
  cin.tie(0);

  int n;
  cin >> n;

  vector<vector<pair<int, int> > > edges(n);
  REP (i, n-1) {
    int v, w, c;
    cin >> v >> w >> c;
    --v, --w;
    edges[v].emplace_back(w, c);
    edges[w].emplace_back(v, c);
  }

  vector<int> par(n);
  vector<int> depth(n);
  vector<long long> sum(n);

  dfs(0, -1, 0, 0, par, depth, sum, edges);

  vector<vector<int> > dp(18, vector<int>(n));
  REP (i, n) dp[0][i] = par[i];
  for (int i = 1; i < 18; i++) {
    REP (j, n) {
      int tmp = dp[i-1][j];
      if (tmp == -1)
        dp[i][j] = -1;
      else
        dp[i][j] = dp[i-1][tmp];
    }
  }
  
  int Q;
  cin >> Q;

  while (Q--) {
    int s, t;
    cin >> s >> t;
    --s, --t;
    int w = lca(s, t, dp, depth);
    long long ret = sum[s] + sum[t] - 2 * sum[w];
    cout << ret << endl;
  }
  
  return 0;
}