secToMin

#include <iostream>

int main()
{
    const int secInMin{ 60 };
    int sec{ 75 };
    int min{ 0 };

    std::cout << " Enter seconds: ";
    std::cin >> sec;

    min = sec / secInMin;
    sec %= secInMin;

    std::cout << min << ":" << sec << '\n';

    return 0;
}