```c
#include<stdio.h>
#include<math.h>
int main()
{
int s, v, b;
scanf("%d%d", &s, &v);
double a = s * 1.0 / v;
if (fmod(a, 1) != 0) {
b = a + 1;
}
else {
b = a;
}
b = b + 10;
b = 1440 - b;
int h = b / 60 + 8;
int m = b % 60;
if (h >= 24) {
printf("%02d:%02d", h - 24, m);
} else {
printf("%02d:%02d", h, m);
}
}
```
by gitmeetcat @ 2023-08-28 09:39:19