N = int(input())
G = [[] for _ in range(N+1)]
for _ in range(N-1):
    a,b,c = map(int,input().split())
    G[a].append((b,c))
    G[b].append((a,c))

n = 1
while n < N:
    n <<= 1
dp = [[0] * (N+1) for _ in range(n)]
depth = [0] * (N+1)
depth2 = [0] * (N+1)
q = []
q.append((1,0))
while len(q):
    now,parent = q.pop()
    for v,c in G[now]:
        if v != parent:
            depth[v] = depth[now] + c
            depth2[v] = depth[now] + 1
            q.append((v,now))
            dp[0][v] = now
for i in range(1,n):
    for j in range(1,N+1):
        dp[i][j] = dp[i-1][dp[i-1][j]]
def lca(u,v):
    if u == v:
        return u
    if depth2[v] > depth2[u]:
        u,v = v,u
    delta = depth2[u] - depth2[v]
    for j in range(n):
        mask = 1 << j
        if delta & mask:
            u = dp[j][u]
    if u == v:return u
    for k in reversed(range(n)):
        if dp[k][u] != dp[k][v]:
            u = dp[k][u]
            v = dp[k][v]
    return dp[0][u]

Q = int(input())
for _ in range(Q):
    s,t = map(int,input().split())
    l = lca(s,t)
    ans = depth[s] + depth[t] - 2 * depth[l]
    print(ans)