C++ :

#include<iostream>
#include<cstdio>
#include<cstdlib>
#include<cmath>
#include<cstring>
#include<algorithm>
using namespace std;
#define eps 1e-3
double ax,ay,bx,by,cx,cy,dx,dy,p,q,r; 
inline int read(){
	int x=0,t=1,c;
	while(!isdigit(c=getchar())) if(c=='-') t=-1;
	while(isdigit(c)) x=x*10+c-'0',c=getchar();
	return x*t;
}
double dis(double x1,double y1,double x2,double y2){return sqrt((x1-x2)*(x1-x2)+(y1-y2)*(y1-y2));}
double calc(double x,double y){
	double lx=cx,ly=cy,rx=dx,ry=dy;
	while(fabs(rx-lx)>eps || fabs(ry-ly)>eps){
		double x1=lx+(rx-lx)/3.0,y1=ly+(ry-ly)/3.0;
		double x2=rx-(rx-lx)/3.0,y2=ry-(ry-ly)/3.0;
		double t1=dis(ax,ay,x,y)/p+dis(x,y,x1,y1)/r+dis(x1,y1,dx,dy)/q;
		double t2=dis(ax,ay,x,y)/p+dis(x,y,x2,y2)/r+dis(x2,y2,dx,dy)/q;
		if(t1>t2) lx=x1,ly=y1;
		else rx=x2,ry=y2;
	}
	return dis(ax,ay,x,y)/p+dis(x,y,lx,ly)/r+dis(lx,ly,dx,dy)/q;
}
void sanfen(){
	double lx=ax,ly=ay,rx=bx,ry=by;
	while(fabs(rx-lx)>eps || fabs(ry-ly)>eps){
		double x1=lx+(rx-lx)/3.0,y1=ly+(ry-ly)/3.0;
		double x2=rx-(rx-lx)/3.0,y2=ry-(ry-ly)/3.0;
		double t1=calc(x1,y1),t2=calc(x2,y2);
		if(t1>t2) lx=x1,ly=y1;
		else rx=x2,ry=y2;
	}
	printf("%.2lf",calc(lx,ly));
}
int main(){
	scanf("%lf%lf%lf%lf",&ax,&ay,&bx,&by);
	scanf("%lf%lf%lf%lf",&cx,&cy,&dx,&dy);
	scanf("%lf%lf%lf",&p,&q,&r);
	sanfen();
	return 0;
}