```
cin >> s >> v;
int ans = ceil(s*1.0/v);
int gethere_t = (480 + 2870 - ans) % 1440;
int gethere_h = gethere_t / 60;//小时
if(gethere_h < 10)
cout << 0;
cout << gethere_h << ":";
int gethere_m = gethere_t % 60;//分钟
if(gethere_m < 10)
cout << 0;
cout << gethere_m << endl;
```
**本人见解，请勿抄袭**
by Foggy_night @ 2022-11-20 19:17:10
@夜雾的i
谢谢，不过我自己已经改好了，要用double定义
by gyttnnd @ 2022-11-20 19:24:16