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#include<bits/stdc++.h>
using namespace std;
double n,p1,v1,p2,v2,l,r,mid;
double calc(double n,double p,double v)
{
return min(n-p+n,p+n)/v;
}
void work()
{
scanf("%lf%lf%lf%lf%lf",&n,&p1,&v1,&p2,&v2);
double ans=min(calc(n,p1,v1),calc(n,p2,v2));
if (p1>p2) swap(p1,p2),swap(v1,v2);
ans=min(ans,max(p2/v2,(n-p1)/v1));
l=p1,r=p2;
for (int i=1; i<=100; i++)
{
mid=(l+r)/2.0;
double ans1=calc(mid,p1,v1),ans2=calc(n-mid,p2-mid,v2);
ans=min(ans,max(ans1,ans2));
if (ans1>ans2) r=mid;
else l=mid;
}
printf("%.10lf\n",ans);
}
int main()
{
int T;
scanf("%d",&T);
while (T--)work();
}
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