from collections import deque

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

#全部を始点にbfs
dist = [[-1]*N for _ in range(N)]

for st in range(N):
    dist[st][st] = 0
    q = deque([st])
    while q:
        now = q.popleft()
        for next in G[now]:
            if dist[st][next]!=-1:
                continue
            dist[st][next] = dist[st][now] + 1
            q.append(next)

for _ in range(Q):
    s, t = map(int, input().split())
    s -= 1
    t -= 1

    ans = 0
    for i in range(N):
        if dist[s][i] == dist[t][i]:
            ans += 1
    print(ans)