-```
#include <stdio.h>
#include <math.h>
int main(){
int i,h,m,x;
double t,s,v;
scanf("%lf %lf",&s,&v);
t=s/v;
t=ceil(t);
for(i=1;i<=8;i++){
if(i60-t-10>0){
break;
}
}
h=8-i;
m=i60-t-10;
if(m<10){printf("0%d:0%d",h,m);
}
else if(m>=10&&m<60){
printf("0%d:%d",h,m);}
else if(m==60){
printf("0%d:00",h+1);}
return 0;
}
