#include <bits/stdc++.h>
using namespace std;
int main() {
  int n;
  cin >> n;
  for (int i = 0; i < n; i++) {
    int a, b;
    cin >> a >> b;
    if (a < b) {
      int tmp;
      tmp = a;
      a = b;
      b = tmp;
    }
    int ans = (a + b) / 3;
    ans = min(ans, min(a, b));
    cout << ans << "\n";
  }
}
