求大佬调调，祝大佬长命百岁

#include<bits/stdc++.h>
using namespace std;
double ans,l,v,z,s,f; 
int main()
{
	cin>>l>>v; 
	s=8,f=60;
	ans=ceil(l/v);
	ans=ans+10;
	if(ans>60)
	{
		z=ans/60;//判断要往前数几个小时
		ans-=z*60;//余下的时间再用60去减 
		if(z<=8)
		{
			cout<<0<<s-z<<":"<<f-ans;
		}
		if(z>8)
		{
		    if(24-(s-z)<=9)cout<<0<<24-(s-z)<<":"<<f-ans;
		    else
		    {
		    	cout<<24-(s-z)<<":"<<f-ans;
			}
		}	 
	}
	else
	{
		cout<<07<<":"<<f-ans;
	}
}