#pragma comment(linker, "/STACK:102400000,102400000")
#include<iostream>
#include<cstring>
#include<cstdio>
#include<vector>
#define MAX_N 40003
using namespace std;

bool vis[MAX_N];

struct edge {
public:
    int to;
    long long cost;

    edge(int t, long long c) : to(t), cost(c) { }

    edge() { }
};

vector<edge> G[MAX_N];
int q,n,m;

struct node {
public:
    int p, v;

    node(int pp, int vv) : p(pp), v(vv) { }

    node() { }
};

vector<node> Q[MAX_N];
int lca[MAX_N], ancestor[MAX_N];

int T, cas = 0;

int father[MAX_N];
void init() {
    for (int i = 0; i <= n; i++)
        father[i] = i;
}

int Find(int u) {
    if (u == father[u])return u;
    else return father[u] = Find(father[u]);
}

void unionSet(int u,int v) {
    int x = Find(u), y = Find(v);
    if (x == y)return;
    father[x] = y;
}

bool Same(int u,int v) {
    return Find(u) == Find(v);
}

long long dis[MAX_N];

void Tarjan(int u,int p) {
    for (int i = 0; i < G[u].size(); i++) {
        int v = G[u][i].to;
        if (v == p)continue;
        dis[v] = dis[u] + G[u][i].cost;
        Tarjan(v, u);
        unionSet(u, v);
        ancestor[Find(u)] = u;
    }
    vis[u] = 1;
    for (int i = 0; i < Q[u].size(); i++) {
        int v = Q[u][i].v;
        if (vis[v])
            lca[Q[u][i].p] = ancestor[Find(v)];
    }
}

pair<int, int> qu[MAX_N];

int main() {
    //cin.sync_with_stdio(false);
    scanf("%d", &T);
    while (T--) {
        scanf("%d%d", &n, &q);
        m = n - 1;
        init();
        memset(vis, 0, sizeof(vis));
        memset(ancestor, 0, sizeof(ancestor));
        memset(dis, 0, sizeof(dis));
        memset(lca, 0, sizeof(lca));
        for (int i = 0; i <= n; i++)G[i].clear();
        for (int i = 0; i <= n; i++)Q[i].clear();

        for (int i = 0; i < m; i++) {
            int u, v;
            long long c;
            scanf("%d%d%I64d", &u, &v, &c);
            G[u].push_back(edge(v, c));
            G[v].push_back(edge(u, c));
        }

        for (int i = 0; i < q; i++) {
            int u, v;
            scanf("%d%d", &u, &v);
            qu[i] = make_pair(u, v);
            Q[u].push_back(node(i, v));
            Q[v].push_back(node(i, u));
        }
        Tarjan(1, 0);

        for (int i = 0; i < q; i++)
            printf("%I64d\n", dis[qu[i].first] + dis[qu[i].second] - 2 * dis[lca[i]]);
    }
    return 0;
}