#include <bits/stdc++.h>
#include <atcoder/all>
using namespace std;
using namespace atcoder;
using ll = long long;
using mint = modint1000000007;
#define rep(i,n) for (int i = 0; i < n; i++)
#define rrep(i,n) for (int i = n-1; i >= 0; i--)
#define rep2(i,a,b) for (int i = a; i < b; i++)
#define rrep2(i,a,b) for (int i = a-1; i >= b; i--)
#define rep3(i,a,b,c) for (int i = a; i < b; i+=c)
#define rrep3(i,a,b,c) for (int i = a-1; i >= b; i-=c)
#define all(v) v.begin(),v.end()
#define rall(v) v.rbegin(),v.rend()
template<class T> bool chmax(T &a, T b){if (a < b){a = b;return true;} else return false;}
template<class T> bool chmin(T &a, T b){if (a > b){a = b;return true;} else return false;}

int n;
ll t1,t2,u1,u2,l1,l2;
int main(){
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
    cin>>n;
    rep(i,n){
        scanf("%lld.%lld %lld.%lld %lld.%lld",&t1,&t2,&u1,&u2,&l1,&l2);
        ll l=100*l1+l2,u=100*u1+u2,t=100*t1+t2;
        ll ok=0,ng=520000;
        while(ng-ok>1){
            ll mid=(ok+ng)/2;
            if(360*mid*t*u+500*mid*mid<=360*360*l*u)ok=mid;
            else ng=mid;
        }
        if(ok<10)cout<<"0.0"<<ok<<"\n";
        else if(ok<100)cout<<"0."<<ok<<"\n";
        else if(ok%100<10)cout<<ok/100<<".0"<<ok%100<<"\n";
        else cout<<ok/100<<'.'<<ok%100<<"\n";
    }
}