#include<stdio.h> #include<math.h> int main() { float n,v1,v2,t,s; while(scanf("%f%f%f%f",&n,&v1,&v2,&t)!=EOF){ if(v1>v2){ if(v1*t-v2*t>=1000*n){ s=n*1000.0/(v1-v2); printf("%.2f\n",s); } else printf("NO\n"); } else printf("NO\n"); } return 0; } |
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