#include<bits/stdc++.h>
#define pair_double pair<double,double>
using namespace std;

double a_x,a_y,b_x,b_y;
double c_x,c_y,d_x,d_y; 
double p,q,r;
double abs_(double num){
	if(num>=0)	return num;
	else	return -num;
}
pair_double mid(double a_x,double a_y,double b_x,double b_y,double x,double y){//x,y 表示线段的位置为 x/y。
	//获取具体位置的函数 
	pair_double ret;
	ret.first=((y-x)*a_x+x*b_x)/y;
	ret.second=((y-x)*a_y+x*b_y)/y;
	return ret; 
}
double pow_(double num){
	return num*num;
}
double length(double a_x,double a_y,double b_x,double b_y){
	double x_=a_x-b_x;
	double y_=a_y-b_y;
	return sqrt(pow_(x_)+pow_(y_));
}
double sanfen2(double e_x,double e_y,double c_x,double c_y,double d_x,double d_y){
	//E 是在 AB 上的点  
	double ans=1e7;
	while(abs(c_x-d_x)>1e-5||abs(c_y-d_y)>1e-5){
//		cout<<c_x
		pair_double ret1=mid(c_x,c_y,d_x,d_y,1,2);
		pair_double ret2=mid(c_x,c_y,d_x,d_y,1,3);
		pair_double ret3=mid(c_x,c_y,d_x,d_y,2,3);
		double f_x=ret2.first;
		double f_y=ret2.second;
		double f_ans=length(f_x,f_y,d_x,d_y)/q+length(f_x,f_y,e_x,e_y)/r;
		double g_x=ret3.first;
		double g_y=ret3.second;
		double g_ans=length(g_x,g_y,d_x,d_y)/q+length(g_x,g_y,e_x,e_y)/r;
		double h_x=ret1.first;
		double h_y=ret1.second;
		if(f_ans<g_ans){
			d_x=h_x;
			d_y=h_y;
		}
		else{
			c_x=h_x;
			c_y=h_y;
		}
		ans=min(ans,min(f_ans,g_ans));
	}
	return ans;
}//内层三分 
double sanfen1(double a_x,double a_y,double b_x,double b_y){
	double final=1e7;
//	cout<<a_x<<' '<<a_y<<' '<<b_x<<' '<<b_y<<endl;  
	while(abs_(a_x-a_y)>1e-5||abs_(b_x-b_y)>1e-5){
//		cout<<'@'<<endl;
		pair_double ret1=mid(a_x,a_y,b_x,b_y,1,2);
		pair_double ret2=mid(a_x,a_y,b_x,b_y,1,3);
		pair_double ret3=mid(a_x,a_y,b_x,b_y,2,3);
		double f_x=ret2.first;
		double f_y=ret2.second;
		double g_x=ret3.first;
		double g_y=ret3.second;
		double f_ans=length(f_x,f_y,a_x,a_y)/p+sanfen2(f_x,f_y,c_x,c_y,d_x,d_y);
		double g_ans=length(g_x,g_y,a_x,a_y)/p+sanfen2(g_x,g_y,c_x,c_y,d_x,d_y);
		double h_x=ret1.first;
		double h_y=ret1.second;
		if(f_ans<g_ans){
			b_x=h_x;
			b_y=h_y;
		}
		else{
			a_x=h_x;
			a_y=h_y;
		}
		final=min(final,min(f_ans,g_ans));
//		cout<<f_x<<' '<<f_y<<' '<<g_x<<' '<<g_y<<endl;
//		cout<<length(f_x,f_y,a_x,a_y)/p<<' '<<sanfen2(f_x,f_y,c_x,c_y,d_x,d_y)<<" "<<f_ans<<endl;
//		cout<<length(g_x,g_y,a_x,a_y)/p<<' '<<sanfen2(g_x,g_y,c_x,c_y,d_x,d_y)<<" "<<g_ans<<endl;
	}
	return final;
}//外层三分 
int main(){
	cin>>a_x>>a_y>>b_x>>b_y;
	cin>>c_x>>c_y>>d_x>>d_y;
	cin>>p>>q>>r;
	printf("%.2lf",sanfen1(a_x,a_y,b_x,b_y));
	return 0;
} 

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