#include <iostream>
#include <vector>
#include <string>
#include <algorithm>
#include <cmath>
#include <tuple>
#include <bitset>

#define rep(i,n) for(i=0; i<n; ++i)
#define in(a) cin >> a
#define out(a,b) cout << a << b
#define print_vec(v) for(auto it=v.begin();it!=v.end();++it)cout<<*it <<" ";cout<<endl
#define print_vec2d(v) for(int i=0;i<v.size();++i){for(int j=0;j<v[i].size();++j)cout<<v[i][j]<<" ";cout<<endl;}cout<<endl
using namespace std;
using lint = long long;

int main(void){
    lint i, j, k, cnt=0;
    lint p, n, m;
    in(n);
    vector<vector<float>> v(n,vector<float> (3));
    rep(i,n){
        rep(j,3){
            in(v[i][j]);
        }
    }

    rep(i,n){
        // 10*v[i][1]*(10*v[i][1]*pow(v[i][0],2))+2*v[i][2]
        float rt=pow(10*v[i][1]*v[i][0],2)+20*v[i][1]*v[i][2];
        float vms=-10*v[i][1]*v[i][0]+sqrt(rt);
        vms=vms*3600.0/1000.0;
        int v_100 = vms*100;
        float vkmh=v_100/100.0;
        printf("%.2f\n", vkmh);
    }
    return 0;
}