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

const int N = 2e5+10;
double INF  = 1e9;
int mod = 1e6+7;
//int mod =  1e9+7;
//int ways[4][2] = {{1,0},{-1,0},{0,1},{0,-1}};

double n,a,b,av,bv,ans;

void solve() {
    ans = 4e18;

    cin>>n>>a>>av>>b>>bv;

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

    double t = (b-a)/(av+bv);

    ans = min(ans,t + max((n - (av * t + a)) / av,(b - bv * t) / bv));
    
    ans = min(ans,(a + n - b + n) / (av + bv));
    
    ans = min(ans,max(a / av,(b - a + n - a) / bv));
    
    ans = min(ans,max((n - b) / bv,(b - a + b) / av));
    
    ans = min(ans,(a + n) / av);
    
    ans = min(ans,(b + n) / bv);
    
    ans = min(ans,(n - a + n)/av);
    
    ans = min(ans,(n - b + n)/bv);

    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;
}