#include<stdio.h> #include<math.h> int main(){ int n,v1,v2,t; double time; while(scanf("%d%d%d%d",&n,&v1,&v2,&t)!=EOF){ if(v1<=v2){ printf("No\n"); }else{ time=n*1000/(v1-v2); if(time<t){ printf("%.2lf\n",time); }else{ printf("No\n"); } } } return 0; } |
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