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={i:None for i in range(1,N+1)}
A=[[1]*J for _ in range(N+1)]
Depth={i:None for i in range(1,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):
    x=Depth[u]
    y=Depth[v]

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

    P=2**(J-1)
    while P>0:
        if upper(u,P)!=upper(v,P):
            u=upper(u,P)
            v=upper(v,P)
        P//=2

    return upper(u,1)
        

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