View Code of Problem 104

#include <stdio.h>
#include<math.h>

int main()
{
  int n,v1,v2,t;
  while(scanf("%d %d %d %d",&n,&v1,&v2,&t)!=EOF)
  {
    if(v2>=v1)
      printf("NO\n");
    else
	{
      double time=1000.0*n/(v1-v2);
      if(time>t)	  
     	printf("NO\n");
	  else
     	printf("%.2lf\n",time);
    }
  }
     return 0;
}