#include <bits/stdc++.h>
using namespace std;

vector<vector<pair<int, int>>> G;
vector<vector<int>> parent;
vector<int> dist, height;
int M = 1;

void dfs(int v, int p) {
    for(auto [nv, c] : G[v]) {
        if(nv == p) continue;
        parent[0][nv] = v;
        height[nv] = height[v] + 1;
        dist[nv] = dist[v] + c;
        for(int lv = 1; lv < M; lv++) {
            parent[lv][nv] = parent[lv - 1][parent[lv - 1][nv]];
        }
        dfs(nv, v);
    }
}

int lca(int u, int v) {
    if(height[u] < height[v]) swap(u, v);
    int k = height[u] - height[v];
    for(int lv = 0; (1 << lv) <= k; lv++) {
        if((k >> lv) & 1) u = parent[lv][u];
    }
    if(u == v) return u;
    for(int lv = M - 1; lv >= 0; lv--) {
        if(parent[lv][u] != parent[lv][v]) {
            u = parent[lv][u];
            v = parent[lv][v];
        }
    }
    return parent[0][u];
}

int main() {
    cin.tie(nullptr);
    ios::sync_with_stdio(false);
    int N;
    cin >> N;
    G.assign(N, vector<pair<int, int>>(0));
    while((1 << M) < N) M++;
    parent.assign(M, vector<int>(N, -1));
    dist.assign(N, 0);
    height.assign(N, 0);

    for(int i = 0; i < N - 1; i++) {
        int a, b, c;
        cin >> a >> b >> c;
        a--; b--;
        G[a].push_back({b, c});
        G[b].push_back({a, c});
    }

    dfs(0, -1);

    int Q;
    cin >> Q;
    while(Q--) {
        int s, t;
        cin >> s >> t;
        s--; t--;
        cout << dist[s] + dist[t] - 2 * dist[lca(s, t)] << "\n";
    }

    return 0;
}