#include<cstdio>
#include<cmath>
#include<bits/stdc++.h>
#define read() ({int x,c,f=1;while((c=getchar())<48||57<c)if(c=='-')f=-1;for(x=c^48;47<(c=getchar())&&c<58;)x=x*10+(c^48);x*f; })

constexpr int N=2e5+2;
double sqr(int x){return x*x;
}
double x[3],v[3];
double f(double k){
	double sum=0;
	for(int i=0;i<3;++i)sum+=
		x[i]*sqrt(1/(1-sqr(k*v[i]))-1);
	return sum;
}
double foo(double theta){
	double s1=sin(theta)/v[0]*v[1], s2=sin(theta)/v[0]*v[2];
	double t0=tan(theta), t1=tan(asin(s1)), t2=tan(asin(s2));
	return x[0]*t0+x[1]*t1+x[2]*t2;
}
int solve0(){
	double h=read();
	x[0]=read(),x[1]=read(),x[2]=read(),v[0]=read(),v[1]=read(),v[2]=read();
	double l=0,r=4e5;
	
	while(r-l>10e-4){
		double mid=(l+r)/2;
		if(f(mid)<h)l=mid;
		else r=mid;
	}
	printf("%lf",(l+r)/2);
	return 0;
}
void solve(){
	double h=read();
	std::pair<int,int> p[3];
	for(int i=0;i<3;++i)p[i].second=read();
	for(int i=0;i<3;++i)p[i].first=read();
	std::sort(p,p+3,std::greater<std::pair<int,int>>());
	for(int i=0;i<3;++i)v[i]=p[i].first;
	for(int i=0;i<3;++i)x[i]=p[i].second;
	
	double l=0,r=acos(-1)/2,mid;
	
	while(r-l>10e-9){
		mid=(l+r)/2;
		if(foo(mid)<h)l=mid;
		else r=mid;
	}
	//printf("angle %lf %lf %lf %lf\n",mid,sin(mid),sin(mid)/v[0]*v[1],sin(mid)/v[0]*v[2]);
	double c0=cos(mid),
	th1=asin(sin(mid)/v[0]*v[1]),c1=cos(th1),
	th2=asin(sin(mid)/v[0]*v[2]),c2=cos(th2);
	printf("%lf\n",x[0]/c0/v[0]+x[1]/c1/v[1]+x[2]/c2/v[2]);
	return ;
}
int main(){
	for(int t=read();t--;)solve();
}
/*
2
10 3 4 3 1 1 1
21 5 12 4 4 3 4
*/