UVa 10773 - Back to Intermediate Math

// UVa 10773 - Back to Intermediate Math

#include <iostream>
#include <cmath>
#include <stdio.h>
using namespace std;

int main() {
	int tt;
	cin >> tt;
	for (int t = 1; t <= tt; t++) {
		double d, v, u;
		cin >> d >> v >> u;
		if (u > v && v != 0) {
			double t1 = d / u;
			double t2 = d / sqrt(u * u - v * v);
			double p = t2 - t1;
			printf("Case %d: %.3f\n", t, p);
		} else
			printf("Case %d: can't determine\n", t);
	}
	return 0;
}