View Code of Problem 104

#include<stdio.h>
int main()
{
	float n,v1,v2,t,s;
	while(scanf("%f%f%f%f",&n,&v1,&v2,&t)!=EOF)
	{
		if(v2>=v1)
		printf("NO\n");
		else
		{
			s=(n*1000)/(v1-v2);
			if(s>t)
			printf("NO\n");
			else
			printf("%.2f\n",s);
		}
	}
	return 0;
}