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#include <iostream>
#include <cmath>
using namespace std;
int main()
{
//char          char x          c 
//int           int x           d
//long long     long long x     lld
//float         float x         f
//double        double x        lf
//long double   long double x   Lf或llf
//bool          bool x          d 
	double h,v,x1,y1,x2,y2,s,t;
	cin>>h>>v>>x1>>y1>>x2>>y2;
	s=sqrt(pow(x2,2)+pow(y2,2));
	s=s+h;
	s=s+sqrt(pow(x1,2)+pow(y1,2));
	t=s/v;
	printf("%0.2lf",t);
	return 0;
	
//pow(a,n)   a的n乘方 
//sqrt()     平方根 
	
//cout<<s;
//

//1*a +   1*b =   y

//2*a +   3*b =   y   x

//a ji           b tu
}