#include <bits/stdc++.h>

using namespace std;

#define FOR(i, a, b) for(int i = (a); i < (b); i++)
#define RFOR(i, a, b) for(int i = (a) - 1; i >= (b); i--)
#define SZ(a) int(a.size())
#define ALL(a) a.begin(), a.end()
#define PB push_back
#define MP make_pair
#define F first
#define S second

typedef long long LL;
typedef vector<int> VI;
typedef pair<int, int> PII;
typedef double db;

db f(db v, db x, db t)
{
	db y = v * t - x;
	if (y < 0)
		return 0;
	if (y > 2 * x)
		return y;
	return (v * t + x) / 2;
}

void solve()
{
	db n, p1, v1, p2, v2;
	cin >> n >> p1 >> v1 >> p2 >> v2;
	if (p1 > p2)
	{
		swap(p1, p2);
		swap(v1, v2);
	}
	db ans = max(p2 / v2, (n - p1) / v1);
	db l = 0, r = 1e9;
	FOR(i, 0, 74)
	{
		db m = (l + r) / 2;
		if (f(v1, p1, m) + f(v2, n - p2, m) >= n)
			r = m;
		else
			l = m;
	}
	ans = min(ans, (l + r) / 2);
	cout << ans << "\n";
}

int main()
{
	ios::sync_with_stdio(0); 
	cin.tie(0);
	cout << fixed << setprecision(15);
	int t;
	cin >> t;
	while (t--)
		solve();
	return 0;
}