#include <bits/stdc++.h>
using namespace std;
long long ans = 0;
int main(int argc, char const *argv[]) {
  int t;
  cin >> t;
  while (t--) {
    int a, b, ans = 0;
    cin >> a >> b;
    if (a == b)
      cout << (a * 2) / 3 << endl;
    else {
      if (a > b) swap(a, b);
      if (b >= 2 * a)
        cout << a << endl;
      else {
        ans = b - a;
        a = 2 * a - b;
        ans += (a * 2) / 3;
        cout << ans << endl;
      }
    }
  }
}
