#include<bits/stdc++.h>
using namespace std;
#define lowbit(x) x&(-x)
#define int long long
#define double long double

void solve() {
	
    double n,a,b,av,bv,ans;
    cin>>n>>a>>av>>b>>bv;

    if(a > b)
	{
        swap(a,b);
        swap(av,bv);
    }

    ans = 4e18l;

    ans = fmin(ans,(n + n - a) / av);
    ans = fmin(ans,(n + n - b) / bv);
    
    ans = fmin(ans,(a + n) / av);
    ans = fmin(ans,(b + n) / bv);
    
    double t = (b - a) / (av + bv);
    
    ans = fmin(ans,t + fmax((n - b + t * bv) / av,(a + t * av) / bv));
    
    ans = fmin(ans,fmax((n - b) / bv,(b + a) / av));
    ans = fmin(ans,fmax(a / av,(n - b + n - a) / bv));
    
    ans = fmin(ans,fmax((n - b) / bv,(b - a + b - a + a) / av));
    ans = fmin(ans,fmax(a / av,(b - a + b - a + n - b) / bv));
    
    if(a / av > (n - b) / bv)
    {
    	double tt = a / av;
    	double x = tt * bv - (n - b);
    	double xx = (av * (n - a - x) - a * bv) / (av + bv);
    	ans = fmin(ans,tt + (a + xx) / av);
	}else
	{
		double tt = (n - b) / bv;
		double x = tt * av - a;
		double xx = (av * (n - a) - bv * (a - x)) / (av + bv);
		ans = fmin(ans,tt + (a - x + xx) / av);
	}


    double xx = (av * (2.0 * (b - a) + n - b) - a * bv) / (2.0 * (av + bv));
    if(xx >= 0.0 && xx <= b - a)
    {
    	ans = fmin(ans,(2 * xx + a) / av);
	}
	
	       xx = (av * (2.0 * (b - a) + n - b) - 2.0 * a * bv) / (2.0 * av + bv);
	if(xx >= 0.0 && xx <= b - a)
	{
		ans = fmin(ans,(2 * a + xx) / av);
	}
	
	       xx = ((b - a + 2.0 * (n - b)) * av - a * bv) / (av + 2.0 * bv);
	if(xx >= 0.0 && xx <= b - a)
	{
		ans = fmin(ans,(a + 2 * xx) / av);
	}
	
    cout<<ans<<endl;


}
signed main() {
    std::ios::sync_with_stdio(false);
    cin.tie(0);
    cout.tie(0);
    cout<<fixed<<setprecision(10);
    int caset = 1;
    cin>>caset;

    for(int i = 1;i<=caset;i++)
	{
		solve();
	}

    return 0;
}