View Code of Problem 104

#include<stdio.h>
#include<string.h>
 
int main(){
	int n,v1,v2,t;
	while(scanf("%d%d%d%d",&n,&v1,&v2,&t)!=EOF)
	{
		if(v1<v2)
		{
			printf("NO\n");
		}
		else
		{
			float time=n*1000.0/(v1-v2);
			if(time<=t)
			{
				printf("%.2f\n",time);
			}
			else
			{
					printf("NO\n");
			}
		}
	}
		return 0;
	}