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)

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

    #sを始点にbfs
    dist_s = [-1]*N 
    dist_s[s] = 0
    q = deque([s])
    while q:
        now = q.popleft()
        for next in G[now]:
            if dist_s[next]!=-1:
                continue
            dist_s[next] = dist_s[now] + 1
            q.append(next)
        
    #tを始点にbfs
    dist_t = [-1]*N 
    dist_t[t] = 0
    q = deque([t])
    while q:
        now = q.popleft()
        for next in G[now]:
            if dist_t[next]!=-1:
                continue
            dist_t[next] = dist_t[now] + 1
            q.append(next)

    ans = 0
    for i in range(N):
        if dist_s[i] == dist_t[i]:
            ans += 1
    print(ans)