from collections import deque
J=18

N=int(input())
E={i:[] for i in range(1,N+1)}
for _ in range(N-1):
    u,v,w=map(int,input().split())
    E[u].append((v,w))
    E[v].append((u,w))

T=[None]*(N+1)
A=[[1]*J for _ in range(N+1)]
Depth=[None]*(N+1)

Q=deque()
T[1]=0
Depth[1]=0
Q.append(1)

while Q:
    v=Q.popleft()
    for (u,w) in E[v]:
        if T[u]==None:
            T[u]=T[v]+w
            Depth[u]=Depth[v]+1
            A[u][0]=v
            Q.append(u)

for p in range(1,J):
    for u in range(1,N+1):
        v=A[u][p-1]
        A[u][p]=A[v][p-1]

def upper(u,k):
    i=0
    while k>0:
        if k%2==1:
            u=A[u][i]
        i+=1
        k//=2
    return u

def lca(u,v):
    if u==v:
        return u
    
    x=Depth[u]
    y=Depth[v]

    u=upper(u,max(x-y,0))
    v=upper(v,max(y-x,0))

    P=2**(J-1)
    for i in range(J-1,-1,-1):
        if A[u][i]!=A[v][i]:
            u=A[u][i]
            v=A[v][i]
            
    return A[u][0]

Q=int(input())
for _ in range(Q):
    u,v=map(int,input().split())
    print(T[u]+T[v]-2*T[lca(u,v)])