#include <bits/stdc++.h>
using namespace std;
int main() {
  ios_base::sync_with_stdio(false);
  cin.tie(NULL);
  int t;
  cin >> t;
  while (t--) {
    long long a, b;
    cin >> a >> b;
    if (a < b) swap(a, b);
    long long diff = a - b;
    long long sub = min(diff, min(a / 2, b));
    a -= sub * 2;
    b -= sub;
    long long ans3 = min(a / 3, b / 3);
    long long aa = a - ans3 * 3, bb = b - ans3 * 3;
    ans3 *= 2;
    long long ans = 0;
    if ((aa and bb) and (aa > 1 or bb > 1)) ans3++;
    cout << sub + ans3 << endl;
  }
}
