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

void solve(){
    double t,mu,l;
    cin >> t >> mu >> l;

    double ue,sita;
    
    sita=mu*t;
    sita+=sqrt((mu*t)*(mu*t)+0.2*mu*l);
    ue=2*mu*l;

    int ans= ue*360/sita;
    cout << fixed << setprecision(2) << (double) ans/100 << endl;
}

int main(){

    int n;
    cin >> n;

    for(int i=0;i<n;i++){
        solve();
    }

    return 0;
}