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

double n;
double p1,p2;
double v1,v2;

const double eps = 1e-8;

int main()
{
    int T;
    cin >> T;
    while(T -- ){
        cin >> n >> p1 >> v1 >> p2 >> v2;
        
        if(p1 > p2) swap(p1,p2),swap(v1,v2);
        
        double a1 = (p1 + n) / v1;
        double a2 = (n - p1 + n) / v1;
        double a3 = (p2 + n) / v2;
        double a4 = (n - p2 + n) / v2;
        double a5 = max((n - p2) / v2,min((p1 + p2) / v1,(p2 + p2 - p1) / v1));
        double a6 = max(p1 / v1,min((n + n - p1 - p2) / v2,(p2 - p1 + n - p1) / v2));
        double a7 = (n + n - p2 + p1) / (v1 + v2);
        double t = (p2 - p1) / (v1 + v2),x = v1 * t;
        double a8 = t + max((p1 > eps ? (x+p1)/v1 : 0),(p2 < n - eps ? (n - p1 - x) / v2 : 0));
        x = (p1*v2+p2*v1+n*v1)/(v1*2+v2*2);
        double a9 = (x>=p1&&x<=p2?(x*2-p1)/v1:1e18);
        x = (n*v1*2-p2*v1-p1*v2) / (v1 + v2);
		double a10 = (x>=0&&x<=n?(x + p1) / v1:1e18);
		x = (n*2*v1-p2*v1+p1*v2)/(v2*2+v1);
		double a11 = (x>=p1&&x<=n?(x*2-p1)/v1:1e18);
		x = (n*v1+p2*v1-p1*v2)/(v1*2+v2);
		double a12 = (x>=0&&x<=p2?(x+p1)/v1:1e18);
        
        
        // double a9 = (1?(x*2-p1)/v1:1e18);
        // x = (n*v1*2-p2*v1-p1*v2) / (v1 + v2);
		// double a10 = (1?(x + p1) / v1:1e18);
		// x = (n*2*v1-p2*v1+p1*v2)/(v2*2+v1);
		// double a11 = (1?(x*2-p1)/v1:1e18);
		// x = (n*v1+p2*v1-p1*v2)/(v1*2+v2);
		// double a12 = (1?(x+p1)/v1:1e18);
        
        printf("%.20lf\n",min({a1,a2,a3,a4,a5,a6,a7,a8,a9,a10,a11,a12}));        
    }

    return 0;
}