70分求助TaT谢谢谢谢谢谢

感觉代码逻辑没什么问题啊 这是为什么```c

#include<stdio.h>
int main()
{
    int s, v, m, h = 0, min = 0;
    double mm;
    scanf("%d %d", &s, &v);
    mm = (double)s / v;
    if (mm != (int)mm)mm += 1;
    m = 480 - 10 - (int)mm;
    for (; m >= 60; h++)m -= 60;
    min = m;
    printf("%02d:%02d", h, min);
    return 0;
}