#include<stdio.h> int main(){ int a,b,v1,v2,n,t; int p1,p2; float time; while(scanf("%d%d%d%d",&n,&v1,&v2,&t)!=EOF) { n=1000*n; p1=v1*t; p2=v2*t+n; if(p1>=p2){ time=n/(v1-v2)*1.0; printf("%.2f\n",time); } else{ printf("NO\n"); } } } |
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