rivercross-with-min-distance.cpp

#include <bits/stdc++.h>
using namespace std;

#define ll long long
#define ull unsigned long long
#define ff first
#define ss second
#define mp make_pair
#define pb push_back

const int N = 2e5 + 11;

void solve()
{
	double d, v, u;
	cin >> d >> v >> u;

	double whenPerpendicular = sqrt(u * u - v * v);
	double whenStraight = u;
	cout<< abs((d/whenStraight) - (d/whenPerpendicular))<<endl;
}

int main()
{
	freopen("input.txt", "r", stdin);
	ios_base::sync_with_stdio(0);
	cin.tie(0);
	cout.tie(0);
	int no_of_test_cases;
	cin >> no_of_test_cases;
	// no_of_test_cases = 1;
	while (no_of_test_cases--)
	{
		solve();
	}

	return 0;
}