#include <bits/stdc++.h>
using namespace std;
typedef long long ll;

int main() {
    int t;
    cin>>t;
    while (t--) {
        double x,y;
        cin>>x>>y;
        double ang=atan2(y,x)*180/acos(-1);
        while (ang>=60) ang-=60;
        while (ang<0) ang+=60;
        cout<<fixed<<ang<<endl;
    }
    return 0;
}