View Code of Problem 104

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


int main(){
	int n,v1,v2,t;
	while((scanf("%d %d %d %d",&n,&v1,&v2,&t)!=EOF)){
		n = n * 1000;
		double v = v1 - v2;
		double t_ = n*1.0/v*1.0;
		if(t_<=t && t_>0)
			printf("%.2lf\n",t_);
		else
			printf("NO\n");
	
	
	}

	return 0;
}