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