```
#include<cstdio>
#include<cmath>
using namespace std;
int main(){
int s,v;
scanf("%d%d",&s,&v);
int t_walk=ceil(1.0*s/v)+10;
int from_zero=60*(24+8)-t_walk;
int hh=(from_zero/60)%24;
int mm=from_zero%60;
printf("%02d:%02d\n",hh,mm);
return 0;
}
```
by No1_TLEman @ 2022-11-28 20:46:33