#include <bits/stdc++.h>
#include <atcoder/all>
using namespace std;
using namespace atcoder;
typedef int64_t lint;
#define rep(i, n) for(int i=0; i<n; i++)
#define repx(i, l, n) for(int i=l; i<n; i++)
#define all(v) v.begin(), v.end()
#define show(x) cout << #x << ": " << x << endl;
#define list(x) cout << #x << ": " << x << "  ";
#define pb push_back
using vi = vector<lint>;
using vvi = vector<vector<lint>>;
template<class T> inline void vin(vector<T>& v) { rep(i, v.size()) cin >> v.at(i); }
template<class T> inline bool chmax(T& a, T b) { if (a < b) { a = b; return 1; } return 0; }
template<class T> inline bool chmin(T& a, T b) { if (a > b) { a = b; return 1; } return 0; }
template<class T> inline void drop(T x) { cout << x << endl; exit(0); }
template<class T> void vout(vector<T> v) { rep(i, v.size()) { cout << v.at(i) << ' '; } cout << endl; }
constexpr lint LINF = LLONG_MAX/2;

int main() {
	lint T;
	cin >> T;

	rep(_, T) {
		string a, b, c;
		lint x, y, z;
		cin >> a >> b >> c;
		x = stoi(a.substr(0, a.size()-3))*100+stoi(a.substr(a.size()-2, 2));
		y = stoi(b.substr(0, b.size()-3))*100+stoi(b.substr(b.size()-2, 2));
		z = stoi(c.substr(0, c.size()-3))*100+stoi(c.substr(c.size()-2, 2));
		lint ok = 0, mid, ng = 10010010;
		while (ng-ok > 1) {
			mid = (ok+ng)/2;
			if (mid*x*y*36 + mid*mid*5 <= z*10*y*360*36) ok = mid;
			else ng = mid;
			// list(mid)
			// list(mid*x*y*36 + mid*mid*5)
			// list(z*10*y*360*36)
			// list(ng)
			// show(ok)
		}
		string s = to_string(ok/10);
		if (s.size() == 1) s = '0'+s;
		if (s.size() == 2) s = '0'+s;
		std::cout << s.substr(0, s.size()-2) << '.' << s.substr(s.size()-2, 2) << '\n';
	}
}