代码如下

#include <iostream> 

using namespace std; 
                               
int main()
{
	int s, v, t, t1=7, t2=50; 
	cin >> s >> v;
	t = s / v;
    if (s % v != 0)        
    {
    	t += 1;
    }

    while (t != 0)
    {
    	if (t2 - t >= 0)
    	{
    	    t2 -= t;
            break;
    	}
    	else
    	{   
    	    t -= t2;
    	    t1 -= 1;
    	    t2 = 60;
    	}
    	if (t1 < 1)
    	{
            t1 = 24;
    	}
    }
   
    if (t1 < 10)
    {
   	cout << "0";
    }
    cout << t1 << ":";
    if (t2 < 10)
    {
    	cout << "0";
    }
    cout << t2;
    return 0;
}