import sys

# sys.setrecursionlimit(10**6)
int1 = lambda x: int(x)-1
p2D = lambda x: print(*x, sep="\n")
def II(): return int(sys.stdin.buffer.readline())
def LI(): return list(map(int, sys.stdin.buffer.readline().split()))
def LI1(): return list(map(int1, sys.stdin.buffer.readline().split()))
def LLI(rows_number): return [LI() for _ in range(rows_number)]
def LLI1(rows_number): return [LI1() for _ in range(rows_number)]
def BI(): return sys.stdin.buffer.readline().rstrip()
def SI(): return sys.stdin.buffer.readline().rstrip().decode()
# dij = [(0, 1), (-1, 0), (0, -1), (1, 0)]
# dij = [(0, 1), (-1, 0), (0, -1), (1, 0), (1, 1), (1, -1), (-1, 1), (-1, -1)]
dij = [(0, 1), (1, 0), (1, 1), (1, -1)]
inf = 10**16
md = 998244353
# md = 10**9+7

class SparseTableMin:
    def __init__(self, aa):
        w = len(aa)
        h = w.bit_length()
        table = [aa]+[[-1]*w for _ in range(h-1)]
        tablei1 = table[0]
        for i in range(1, h):
            tablei = table[i]
            for j in range(w-(1 << i)+1):
                rj = j+(1 << (i-1))
                tablei[j] = min(tablei1[j], tablei1[rj])
            tablei1 = tablei
        self.table = table

    def min(self, l, r):
        i = (r-l).bit_length()-1
        tablei = self.table[i]
        Lmin = tablei[l]
        Rmin = tablei[r-(1 << i)]
        if Lmin < Rmin: Rmin = Lmin
        return Rmin

class LCA:
    def __init__(self, et, depth, first):
        n = len(depth)
        self.sp = SparseTableMin([(depth[u], u) for u in et])
        self.first = first

    def get_lca(self, u, v):
        l, r = self.first[u], self.first[v]
        if l > r: l, r = r, l
        return self.sp.min(l, r+1)[1]

def EulerTour(to, root=0):
    n = len(to)
    et = []
    depth = [0]*n
    first = [0]*n
    par = [-1]*n
    toi = [0]*n
    stack = [root]
    while stack:
        u = stack.pop()
        et.append(u)
        i = toi[u]
        if i == 0: first[u] = len(et)-1
        if i != len(to[u]):
            v, c = to[u][i]
            if v == par[u]:
                stack.append(u)
                et.pop()
            else:
                depth[v] = depth[u]+1
                cost[v] = cost[u]+c
                par[v] = u
                stack.append(u)
                stack.append(v)
            toi[u] += 1
    return et, depth, first

n = II()
to = [[] for _ in range(n)]
for _ in range(n-1):
    u, v, c = LI1()
    to[u].append((v, c+1))
    to[v].append((u, c+1))
cost = [0]*n
et, depth, first = EulerTour(to)
lca = LCA(et, depth, first)
for _ in range(II()):
    u, v = LI1()
    w = lca.get_lca(u, v)
    print(cost[u]+cost[v]-cost[w]*2)