#include<bits/stdc++.h>
using namespace std;

using LL = long long;
#define double long double
#define int LL
double n, m;
const int N = 3e5 + 10;
const int M = N * 2;
const double eps=1e-9;

double p1,v1,p2,v2;
bool check(double x) {
    double t1=p1/v1;
    double t2=(n-p2)/v2;
    t1=x-t1;
    t2=x-t2;
    if(t1>=eps&&t2>=eps) {
        if(v1*t1+v2*t2>=(p2-p1)*2.0)return true;
    }


    t1=p1*2.0/v1;
    t2=(n-p2)*2.0/v2;
    t1=x-t1;
    t2=x-t2;
    if(t1>=eps&&t2>=eps) {
        if(v1*t1+v2*t2>=p2-p1)return true;
    }


    return false;
}
void solve() {

    cin>>n>>p1>>v1>>p2>>v2;
    if(p1>=p2) {
        swap(p1,p2);
        swap(v1,v2);
    }
    double res=0;
    double l=0,r=2e7;
    //for(int i=1;i<=100;i++)
    while(r-l>eps) {
        double mid=(l+r)/2;
        if(check(mid))r=mid,res=mid;
        else l=mid;
    }

    //p1走全程
    if((p1+n)/v1<=res) {
        res=(p1+n)/v1;
    }
    if((n+n-p1)/v1<=res) {
        res=(n+n-p1)/v1;
    }

    //p2走全程
    if((n+n-p2)/v2<=res) {
        res=(n+n-p2)/v2;
    }
    if((n+p2)/v2<=res) {
        res=(n+p2)/v2;
    }

    if((p1/v1)*v2-(n-p2)>=(n-p1)) {
        if(res>=(p1/v1))res=p1/v1;
    }

    if(((n-p2)/v2)*v1-p1>=p2) {
        if(res>=(n-p2)/v2)res=(n-p2)/v2;
    }

    if(res>=max(p2/v2,(n-p1)/v1)) {
        res=max(p2/v2,(n-p1)/v1);
    }

    cout<<fixed<<setprecision(10)<<res<<"\n";
}

signed main() {
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
    cout.tie(nullptr);
    int T = 1;
    cin >> T;
    while (T--)solve();
    return 0;
}
/*
1
2 1
a/b/c
a/b/d
e
 */