#include <bits/stdc++.h>
using namespace std;
typedef double db;
int main()
{
	int T;cin>>T;
	while(T--){
		db n; 
		db p1,p2,v1,v2;
		cin>>n>>p1>>v1>>p2>>v2;
		if(p1>p2) swap(p1,p2),swap(v1,v2);
		db res=(p1+n-p2+n)/(v1+v2);
		res=min(res,max(p1/v1,(n-p2+n-p1)/v2));
		res=min(res,max((n-p2)/v2,(p1+p2)/v1));
		printf("%.12lf\n",res);
	}
	return 0;
}