import java.util.*;

public class Main {
    static ArrayList<HashMap<Integer, Integer>> graph = new ArrayList<>();
    static int n;
    static int[][] parents;
    static int[] costs;
    static int[] depths;
	public static void main (String[] args) {
		Scanner sc = new Scanner(System.in);
		n = sc.nextInt();
		for (int i = 0; i < n; i++) {
		    graph.add(new HashMap<>());
		}
		for (int i = 0; i < n - 1; i++) {
		    int a = sc.nextInt() - 1;
		    int b = sc.nextInt() - 1;
		    int c = sc.nextInt();
		    graph.get(a).put(b, c);
		    graph.get(b).put(a, c);
		}
		parents = new int[20][n];
		costs = new int[n];
		depths = new int[n];
        setDepth(0, 0, 0, 0);
        for (int i = 1; i < 20; i++) {
            for (int j = 0; j < n; j++) {
                parents[i][j] = parents[i - 1][parents[i - 1][j]];
            }
        }
        int q = sc.nextInt();
        StringBuilder sb = new StringBuilder();
        for (int i = 0; i < q; i++) {
            int a = sc.nextInt() - 1;
            int b = sc.nextInt() - 1;
            int lca = getLCA(a, b);
            sb.append(costs[a] - costs[lca] * 2 + costs[b]).append("\n");
        }
        System.out.print(sb);
   }
   
   static int getLCA(int a, int b) {
       if (depths[a] < depths[b]) {
           return getLCA(b, a);
       }
       for (int i = 19; i >= 0 && depths[a] > depths[b]; i--) {
           if (depths[a] - depths[b] >= (1 << i)) {
               a = parents[i][a];
           }
       }
       if (a == b) {
           return a;
       }
       for (int i = 19; i >= 0; i--) {
           if (parents[i][a] != parents[i][b]) {
               a = parents[i][a];
               b = parents[i][b];
           }
       }
       return parents[0][a];
   }
   
   static void setDepth(int idx, int p, int d, int c) {
       parents[0][idx] = p;
       costs[idx] = c;
       depths[idx] = d;
       for (int x : graph.get(idx).keySet()) {
           if (x == p) {
               continue;
           }
           setDepth(x, idx, d + 1, c + graph.get(idx).get(x));
       }
   }
}