已经解决了，如果有疑问，可以来提问
```c
#include<stdio.h>
#include<math.h>
int main() {
int s, v, h, m, m1;
scanf("%d%d", &s, &v);
int t = s / v;
if (s % v)
t += 1;
m1 = 7 * 60 + 50 - t;
if (m1 < 0)
m1 += (24 * 60);
h = m1 / 60;
m = m1 % 60;
printf("%02d:%02d", h, m);
return 0;
}
by ZOECCCCCCCC @ 2023-11-29 11:28:03