#include<stdio.h> #include<math.h> int main(){ int n,v1,v2,t; double a; while(scanf("%d%d%d%d",&n,&v1,&v2,&t)) { a=1.0*n*1000/fabs((v1-v2)); if(a<=t) printf("%0.2f\n",a); else printf("NO\n"); } return 0; } |
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