#pragma GCC optimize(3, "Ofast", "inline")
#include <iostream>
#include <bits/stdc++.h>
#define IOS ios::sync_with_stdio(false), cin.tie(0), cout.tie(0)
#define INF 0x3f3f3f3f
#define L_INF 0x7f3f3f3f3f3f3f3f
#define db cout << "debug\n";

using namespace std;
const int Mod = 998244353;
using ll = long long;

double abs2(double a) { return a < 0 ? -a : a; }
double max(double a, double b) { return a > b ? a : b; }
double min(double a, double b) { return a < b ? a : b; }
double n, p1, p2, v1, v2, t, minn;

void solve()
{
    cin >> n >> p1 >> v1 >> p2 >> v2;
    if (p2 < p1)
    {
        t = p1;
        p1 = p2;
        p2 = t;
        t = v1;
        v1 = v2;
        v2 = t;
    }
    minn = min((n / 2 - abs2(n / 2 - p1) + n) / v1, (n / 2 - abs2(n / 2 - p2) + n) / v2);
    minn = min(minn, (n * 2 - p2 + p1) / (v1 + v2));
    minn = min(minn, max((n - p1) / v1, p2 / v2));
    cout << fixed << setprecision(10) << minn << '\n';
}
int main()
{
    IOS;
// freopen("in.txt", "r", stdin);
// freopen("out.txt", "w", stdout);
#ifndef ONLINE_JUDGE
    clock_t start_time = clock();
#endif
    int t = 1;
    cin >> t;
    while (t--)
    {
        solve();
    }
#ifndef ONLINE_JUDGE
    cout << "Used " << (double)(clock() - start_time) << " ms" << endl;
#endif
    return 0;
}