#include <iostream>

#include <cstring>

#include <cstdio>

#include <cmath>

using namespace std;

struct point

{

	double x,y;

	point() {}

	point(double a,double b) {x=a,y=b;}

	point operator + (const point &a) const {return point(x+a.x,y+a.y);}

	point operator * (const double &a) const {return point(x*a,y*a);}

}s1,t1,s2,t2;

double P,Q,R,ans;

inline double dis(point a,point b)

{

	return sqrt((b.x-a.x)*(b.x-a.x)+(b.y-a.y)*(b.y-a.y));

}

inline double calc(point a,point b)

{

	double tmp=dis(s1,a)/P+dis(a,b)/R+dis(b,t2)/Q;

	ans=min(ans,tmp);

	return tmp;

}

double check(point S)

{

	point l=s2,r=t2,m1,m2;

	for(int i=1;i<=50;i++)

	{

		m1=(l*(2.0/3))+(r*(1.0/3)),m2=(l*(1.0/3))+(r*(2.0/3));

		if(calc(S,m1)<calc(S,m2))	r=m2;

		else	l=m1;

	}

	return calc(S,l);

}

int main()

{

	scanf("%lf%lf%lf%lf%lf%lf%lf%lf%lf%lf%lf",&s1.x,&s1.y,&t1.x,&t1.y,&s2.x,&s2.y,&t2.x,&t2.y,&P,&Q,&R);

	point l=s1,r=t1,m1,m2;

	ans=1e10;

	for(int i=1;i<=50;i++)

	{

		m1=(l*(2.0/3))+(r*(1.0/3)),m2=(l*(1.0/3))+(r*(2.0/3));

		if(check(m1)<check(m2))	r=m2;

		else	l=m1;

	}

	printf("%.2lf",ans);

	return 0;

}//0 0 100 0 100 100 0 100 2 2 1