#include<bits/stdc++.h>
using namespace std;
#define int long long
void solve(){
    double n,p1,v1,p2,v2;
    cin>>n>>p1>>v1>>p2>>v2;
    if(p1 > p2) swap(p1, p2), swap(v1, v2);


    auto check = [&](double mid){
           double l1 = mid * v1, l2 = mid * v2;

                 double x1 = (l1 - p1) / 2;
                 double x2 = (l2 - (n - p2)) / 2;
                 if(p1 + x1 >= p2 - x2) return 1;


                 x1 = (l1 - p1) / 2;
                 x2 = (l2 - 2 * (n - p2));
                 if(p1 + x1 >= p2 - x2) return 1;


                 x1 = (l1 - 2 * p1);
                 x2 = (l2 - (n - p2)) / 2;
                 if(p1 + x1 >= p2 - x2) return 1;


                 x1 = (l1 - p1 * 2);
                 x2 = (l2 - (n - p2) * 2);
                 if(p1 + x1 >= p2 - x2) return 1;
                 
                 
                 
                 if(l1 >= p1 + n) return 1;
                 if(l2 >= (n - p2) + n) return 1;

           if(l1 >= (n - p1) && l2 >= p2) return 1;
           return 0;
    };

    double l = 0, r = 1e9;
    for(int i = 0; i < 200; i++){
          double mid = (l + r)/2;
          if(check(mid)) r = mid;
          else l = mid;
    }

    cout << setprecision(18) << l << '\n';


}
signed main(){
    int t;
    cin>>t;
    while(t--) solve();
}