#include <bits/stdc++.h>
using namespace std;
int main() {
  int t;
  cin >> t;
  while (t--) {
    int a, b;
    cin >> a >> b;
    int ans = (long long)(a + b) / 3;
    ans = min(ans, min(a, b));
    cout << ans << '\n';
  }
  return 0;
}
