#include <bits/stdc++.h>
using namespace std;
#include <atcoder/all>
using namespace atcoder;
#define rep(i, n) for (int i = 0; i < (int)(n); i++)
#define rep1(i, n) for (int i = 1; i < (int)(n + 1); i++)
using ll = long long;
using P = pair<int, int>;
using Graph = vector<vector<int>>;
using mint = modint998244353;
#define INF  10000000

int main()
{
    ios_base::sync_with_stdio(0);
    cin.tie(0);

    int n, q;
    cin >> n >> q;

    Graph g(n, vector<int>(n, INF));
    rep(i, n-1)
    {
        int a, b;
        cin >> a >> b;
        a--;
        b--;
        g[a][b] = 1;
        g[b][a] = 1;
    }
    rep(i, n)g[i][i] = 0;

    rep(k, n)
    rep(i, n)
        rep(j, n)
            g[i][j] = min(g[i][j], g[i][k] + g[k][j]);


    rep(i, q){
        int s, t; cin >> s >> t;
        s--; t--;
        int ans = 0;
        rep(j, n){
            if(j==s || j==t)continue;
            if(g[j][s] == g[j][t] && g[j][s] !=INF && g[j][t] != INF)ans++;
        }
        cout << ans << "\n";
    }


}