第9个测试点一直出错，求助！！！```c
#include <stdio.h>
#include <math.h>
int main(void)
{
int s, v, t;
t = 0;
scanf("%d %d", &s, &v);
t = floor(s / v) + 11;
int h, m;
m = t % 60;
h = floor(t/60);
int H, M;
M = 60 - m;
H = 7 - h + floor(M/60);
while (H < 0)
{
H += 24;
}
printf("%02d:%02d", H, M%60);
return 0;
}
