// もちろん落ちるけど
#include <bits/stdc++.h>
using namespace std;
typedef double Double;
#define double long double
double solve(int a,int b,int t){
	double l = 0 , r = 10;
	for(int i = 0 ; i < 256 ; i++){
		double m = (l+r) / 2;
		double v = a * m + b * log(m) - log(t);
		if( v < 0 ){
			l = m;
		}else{
			r = m;
		}
	}
	return l;
}

int main(){
	ios::sync_with_stdio(false);
	int n;
	cin >> n;
	for(int i = 0 ; i < n ; i++){
		int a,b,t;
		cin >> a >> b >> t;
		printf("%.16lf\n",(Double)exp(solve(a,b,t)));
		//cout << solve(a,b,t) << endl;
	}
}