#include<bits/stdc++.h>
using namespace std;
typedef long long ll;
const int nax = 1e5 + 7;
vector<pair<int, int>>edge[nax];
vector<vector<int>>dp(nax, vector<int>(22));
vector<int>tin(nax, 0);
vector<int>tout(nax, 0);
vector<int>dp1(nax, 0);
int timer;
void dfs(int child, int par) {
	tin[child] = timer++;
	dp[child][0] = par;
	for (int i = 1; i < 20; i++) {
		dp[child][i] = dp[dp[child][i - 1]][i - 1];
	}
	for (auto k : edge[child]) {
		if (k.first != par) {
			dp1[k.first] = k.second + dp1[child];
			dfs(k.first, child);
		}
	}
	tout[child] = timer++;
}
bool isancesstor(int u, int v) {
	return (tin[v] >= tin[u] && tout[u] >= tout[v]);
}
int lca(int u, int v) {
	if (isancesstor(u, v))return u;
	if (isancesstor(v, u))return v;
	for (int i = 19; i >= 0; i--) {
		if (!isancesstor(dp[u][i], v)) {
			u = dp[u][i];
		}
	}
	return dp[u][0];
}
int main() {
	ios_base::sync_with_stdio(false);
	cin.tie(NULL);
	int n;
	cin >> n;
	for (int i = 0; i < (n - 1); i++) {
		int x, y, val;
		cin >> x >> y >> val;
		edge[x].push_back({y, val});
		edge[y].push_back({x, val});
	}
	dfs(1, 0);
	tout[0] = 1e9;
	int q;
	cin >> q;
	// for (int i = 1; i <= n; i++) {
	// 	cout << dp1[i] << " ";
	// }
	// cout << endl;
	for (int i = 0; i < q; i++) {
		int x, y;
		cin >> x >> y;
		int get_lca = lca(x, y);
		cout << dp1[x] + dp1[y] - 2 * dp1[get_lca] << endl;
	}
}