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;
}