#include<bits/stdc++.h>
#define Alex std::ios::sync_with_stdio(false),std::cin.tie(0),std::cout.tie(0);
#define int long long
//#define double
const int QAQ = 0;
const int mod = 1e9 + 7;
const int P = 998244353;
const double pi = std::acos(-1.0);
const double eps = 1e-10;
const int G = 3;
const int Gi = 332748118; 
const int N = 5002105;
std::mt19937 doge;

inline void Fre() {	int liujiahui = 142857; }

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

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

    ans = 4e18l;

    ans = std::fmin(ans,(n + n - a) / av);
    ans = std::fmin(ans,(n + n - b) / bv);
    
    ans = std::fmin(ans,(a + n) / av);
    ans = std::fmin(ans,(b + n) / bv);
    
    double t = (b - a) / (av + bv);
    
    ans = std::fmin(ans,t + std::fmax((n - b + t * bv) / av,(a + t * av) / bv));
    
    ans = std::fmin(ans,std::fmax((n - b) / bv,(b + a) / av));
    ans = std::min(ans,std::fmax(a / av,(n - b + n - a) / bv));
    
    ans = std::fmin(ans,std::fmax((n - b) / bv,(b - a + b - a + a) / av));
    ans = std::fmin(ans,std::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 = std::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 = std::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 = std::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 = std::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 = std::fmin(ans,(a + 2 * xx) / av);
	}
	std::cout<<ans<<'\n';


}
signed main() 
{
	Fre();
    Alex;
    std::cout<<std::fixed<<std::setprecision(5);
    int _;
    std::cin>>_;
    while(_--) solve();
    return QAQ;
}