#include<stdio.h> int main() { int n,v1,v2; float t; while(scanf("%d %d %d %d",&n,&v1,&v2,&t)!=EOF) { n=n*1000; if(v2>=v1) printf("NO\n"); else { if(v1*t>v2*t+n) { t=n*1.0/(v1-v2); printf("%.2f\n",t); } else printf("NO\n"); } } } |
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