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#include <iostream>
 
class vr
{
    int hours;
    int minutes;
public:
    vr(const int h = 0, const int m = 0)
        :hours(h)
        ,minutes(m)
    { normalize(); }
    
    void normalize()
    {
        const auto h = minutes/60;
        hours += h;
        minutes -= h*60;
    }
    
    friend vr operator+(const vr& lhs, const vr& rhs)
    {
        vr result(lhs.hours + rhs.hours, lhs.minutes + rhs.minutes);
        result.normalize();
        return result;
    }
    
    template<class T> 
        friend ::std::basic_ostream<T>& 
    operator<<(::std::basic_ostream<T>& os, const vr& obj)
    {
        return os<<"hours: "<<obj.hours << " : minutes: "<<obj.minutes;
    }
    
    void set(const int h, const int m)
    {
        hours = h;
        minutes = m;
        normalize();
    }
    
};

void read(vr& dst)
{
    int h,m;
    std::cin>>h>>m;
    dst.set(h,m);
}    
    
int main()
{
    vr o1, o2;
    read(o1);
    read(o2);
    
    
    vr o3 = o1 + o2;
    
    std::cout <<"o1: " << o1 << '\n';
    std::cout <<"o2: " << o2 << '\n';
    std::cout <<"o3: " << o3 << '\n';
}

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Compilation time: 0.43 sec, absolute running time: 0.14 sec, cpu time: 0 sec, memory peak: 3 Mb, absolute service time: 0.58 sec