#include<iostream> 
#include<bits/stdc++.h>
using namespace std;
int main()
{
	int s,v,t,h,min;
	cin>>s>>v;
	t=ceil(s/v)+10+1;
	if(t/60>8)
	{
		h=32-t/60; 
		min=60-t%60;
	}
	else
	{
		h=8-1-t/60;
		min=60-t%60;
	}
		if(h>10)
		{
			if(min>10)
			{
				cout<<h<<":"<<min;
			}
			else
			{
				cout<<h<<":0"<<min;
			}
		}
		else
		{
			if(min>10)
			{
				cout<<"0"<<h<<":"<<min;
			}
			else
			{
				cout<<"0"<<h<<":0"<<min;
			}
		}
	return 0;
}

帮忙修改一下谢谢