#include <iostream>
#include <string>
using namespace std;
int hour = 8;
int minute = 0;
void func(int time)
{
	int h = time/60+1;
	minute = 60-time%60;
	if(h<=8) hour -= h;
	else	hour = 31-hour;
}
int main ()
{
	int s,v = 0;
	cin>>s>>v;
	int time = 0;
	if(s%v == 0) time = s/v;
	else time = (s/v)+1;
    time+=10;
	func(time);
	if(hour<10) cout<<"0";
	cout<<hour<<":";
    if(minute<10) cout<<"0";
    cout<<minute;
    system("pause");
}

求大佬的帮助