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