#include <bits/stdc++.h>

const int MAXN = 1000005;
const int MAXM = 1000005;

using namespace std;

struct Edge {
	int to, nxt, w;
} E[MAXN << 1];

int H[MAXN], F[MAXN], tot;

inline void Add_Edge (const int u, const int v, const int w) {
	E[++ tot] = {v, H[u], w}, H[u] = tot;
	E[++ tot] = {u, H[v], w}, H[v] = tot;
}

bool Vis[MAXN];
int Siz[MAXN], Max[MAXN];
long long Ans[MAXN];
int rt, Now;

inline void DFS1 (const int x, const int f) {
	Siz[x] = 1, Max[x] = 0;
	for (int i = H[x]; i; i = E[i].nxt)
		if (E[i].to != f && !Vis[E[i].to])
			DFS1 (E[i].to, x), Siz[x] += Siz[E[i].to], Max[x] = max (Max[x], Siz[E[i].to]);
	Max[x] = max (Max[x], Now - Siz[x]);
	if (Max[x] < Max[rt] || !rt) rt = x;
}

struct Node {
	int x;
	long long dis;
	
	inline bool operator < (const Node &a) const {
		return x < a.x;
	}
};

struct Ques {
	int l, id;
};

vector <int > P[MAXN];
vector <Ques> I[MAXN];
vector <Node> S;

inline void DFS2 (const int x, const int f, const long long dis) {
	S.push_back ({x, dis});
	for (int i = H[x]; i; i = E[i].nxt) 
		if (E[i].to != f && !Vis[E[i].to])
			DFS2 (E[i].to, x, dis + E[i].w);
}

Node Stack[MAXN];
int top = 0;

inline void DFS3 (const int x, const int f) {
	Vis[x] = 1, S.clear ();
	// for (int i = H[x]; i; i = E[i].nxt)
		// if (E[i].to != f && !Vis[E[i].to])
	DFS2 (x, f, 0);
	
	sort (S.begin (), S.end ()), top = 0;
	
	for (int i = 0; i < (int) S.size (); ++ i) {
		while (top && S[i].dis <= Stack[top].dis) -- top;
		if (top) P[S[i].x].push_back (Stack[top].x);
		Stack[++ top] = S[i];
	}
	
	top = 0;
	
	for (int i = (int) S.size () - 1;  ~ i; -- i) {
		while (top && S[i].dis <= Stack[top].dis) -- top;
		if (top) P[Stack[top].x].push_back (S[i].x);
		Stack[++ top] = S[i];
	}
	
	for (int i = H[x]; i; i = E[i].nxt)
		if (E[i].to != f && !Vis[E[i].to])
			Now = Siz[E[i].to], rt = 0, DFS1 (E[i].to, x), DFS3 (rt, x);
}

int N, Q;
int u, v, w;

namespace Tree_Cut {
	int Son[MAXN], Top[MAXN], Dep[MAXN];
	long long Dis[MAXM];
	
	inline void DFS_1 (const int x, const int f, const long long dis = 0) {
		Dep[x] = Dep[F[x] = f] + 1, Siz[x] = 1, Dis[x] = dis;
		for (int i = H[x]; i; i = E[i].nxt)
			if (E[i].to != f)
				DFS_1 (E[i].to, x, dis + E[i].w), Siz[x] += Siz[E[i].to], Siz[E[i].to] > Siz[Son[x]] ? Son[x] = E[i].to : Son[x];
	}
	
	inline void DFS_2 (const int x, const int top) {
		Top[x] = top;
		if (Son[x]) DFS_2 (Son[x], top);
		for (int i = H[x]; i; i = E[i].nxt)
			if (E[i].to != F[x] && E[i].to != Son[x])
				DFS_2 (E[i].to, E[i].to);
	}
	
	inline int LCA (int u, int v) {
		while (Top[u] != Top[v])
			Dep[Top[u]] > Dep[Top[v]] ? u = F[Top[u]] : v = F[Top[v]];
		return Dep[u] > Dep[v] ? v : u; 
	}
	
	
	inline long long GetDis (const int u, const int v) {
		return Dis[u] + Dis[v] - (Dis[LCA (u, v)] << 1);
	}
}

namespace BIT {
	long long T[MAXN];
	
	#define lowbit(x) (x & -x)
	
	inline void Build () {
		memset (T, 127, sizeof T);
	}
	
	inline void Add (int x, const long long v) {
		while (x) T[x] = min (T[x], v), x -= lowbit (x); 
	}
	
	inline long long Que (int x) {
		long long Ret = (1ll << 62);
		while (x <= N) Ret = min (Ret, T[x]), x += lowbit (x);
		return Ret;
	}
}

using namespace Tree_Cut;

int main () {
	
	cin >> N, Now = N;
	
	for (int i = 2; i <= N; ++ i)
		cin >> u >> v >> w, Add_Edge (u, v, w);
		
	DFS1 (1, 0), DFS3 (1, 0);
	
	DFS_1 (1, 0), DFS_2 (1, 1);
	
//	cerr << "N = " << N << '\n';
	
//	for (int i = 1; i <= N; ++ i) {
//		cerr << "R = " << i << '\n';
//		for (auto p : P[i]) cerr << "L = " << p << ", Dis = " << GetDis (p, i) << '\n';
//	}
	
	cin >> Q, BIT::Build ();
	
	for (int i = 1; i <= Q; ++ i)
		cin >> u >> v, I[v].push_back ({u, i});
	
	for (int i = 1; i <= N; ++ i) {
		for (auto p : P[i]) if (p != i) BIT::Add (p, GetDis (i, p));
		for (auto p : I[i]) Ans[p.id] = BIT::Que (p.l);
	}
	
	for (int i = 1; i <= Q; ++ i)	
		cout << (Ans[i] == (1ll << 62) ? -1 : Ans[i]) << '\n';
	
	return 0;
}