#include<bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef pair<int, int> PII;
typedef pair<ll, int> PLI;
typedef pair<int, ll> PIL;
#define x first
#define y second
const int N = 2e6 + 20;
const int mod = 998244353;
const int INF = 0x3f3f3f3f;
int n, k, p, s, t, maxd;
vector<PII> node[N];
ll dis[N];
bool vis[N];

void init(){
    maxd = 0;
    for(int i = 1; i <= 2 * n; i++){
        node[i].clear();
    }
}

void dfs(int u, int fa, int d){
    for(auto [v, w]: node[u]){
        if(v == fa) continue;
        dfs(v, u, d + 1);
    }
    node[n + d].push_back({u, 0});
    node[u].push_back({n + d, 0});
    maxd = max(maxd, n + d);
}

void dijkstra(){
    memset(dis, 0x3f, sizeof dis);
    memset(vis, 0, sizeof vis);
    priority_queue<PLI, vector<PLI>, greater<PLI> > q;
    dis[s] = 0;
    q.push({0, s});
    while(!q.empty()){
        auto it = q.top();
        q.pop();
        ll nowdis = it.x;
        int nowid = it.y;
        if(vis[nowid]) continue;
        vis[nowid] = true;
        for(auto [v, w]: node[nowid]){
            if(vis[v]) continue;
            if(nowdis + w < dis[v]){
                dis[v] = min(dis[v], nowdis + w);
                q.push({dis[v], v});    
            }
        }
    }
}

void solve(){
    scanf("%d", &n);
    init();
    for(int i = 1; i < n; i++){
        int u, v, w;
        scanf("%d%d%d", &u, &v, &w);
        node[u].push_back({v, w});
        node[v].push_back({u, w});
    }
    dfs(1, -1, 1);
    scanf("%d%d", &k, &p);
    for(int i = n+1; i+k <= maxd; i++){
        node[ i].push_back({ i + k, p});
        node[i + k].push_back({ i, p});
    }
    scanf("%d%d", &s, &t);
    dijkstra();
    printf("%lld\n", dis[t]);
}

int main(){
    int T = 1;
    scanf("%d", &T);
    while(T--){
        solve();
    }
    return 0;
}