#include <bits/stdc++.h>
#define ll long long
#define Ma 1000005
#define mod 998244353
#define IOS ios::sync_with_stdio(0);cin.tie(0);cout.tie(0);
#define ld long double
#define eps 1e-12
using namespace std;

ld n,p1,v1,p2,v2;


ll sgn(ld x)
{
	if (fabs(x)<eps)
		return 0;
	if (x<0)
		return -1;
	return 1;
}

ld gw(ld r,ld x,ld v)
{
	if (x>=r+eps)
		return x/v;
	return (min(x,(r-x))+r)/v;
}


void sol()
{
	cin>>n>>p1>>v1>>p2>>v2;
	ld ans=min(gw(n,p1,v1),gw(n,p2,v2));
	//printf("ans=%.6Lf\n",ans);
	ld l=0,r=n;
	while (r-l>=eps)
	{
		ld mid1=l+(r-l)/3,mid2=mid1+(r-mid1)/2;
		ld val1=min(max(gw(mid1,p1,v1),gw(n-mid1,n-p2,v2)),max(gw(n-mid1,n-p1,v1),gw(mid1,p2,v2)));
		ld val2=min(max(gw(mid2,p1,v1),gw(n-mid2,n-p2,v2)),max(gw(n-mid2,n-p1,v1),gw(mid2,p2,v2)));
		ans=min({ans,val1,val2});
		if (val1>val2)
			l=mid1;
		else
			r=mid2;	
		//printf("l=%.6Lf r=%.6Lf mid1=%.6Lf mid2=%.6Lf\n",l,r,mid1,mid2);
	}
	printf("%.6Lf\n",ans);
}


int main()
{
	IOS
	ll tt=1;
	cin>>tt;
	while (tt--)
		sol();
	return 0;
}