一个C++关于类使用的问题！

这是我的头文件：

#ifndef MYTIME3_H_INCLUDED
#define MYTIME3_H_INCLUDED
#include <iostream>

class Time
{
private:
int hours;
int minutes;
public:
Time();
Time(int h,int m=0);
void Addmin(int m);
void Addhou(int h);
void Reset(int h=0,int m=0);
Time operator+(const Time & t)const;
Time operator-(const Time & t)const;
Time operator*(double n)const;
friend Time operator*(double m,const Time & t)
{
return t*m;
}; //inline definition.
friend std::ostream & operator<<(std::ostream & os,const Time & t);
//overload the operator"<<" and return a object of ostream.

#endif // MYTIME3_H_INCLUDED

这是头文件中函数的定义：

#include "mytime3.h"

Time::Time()
{
hours = minutes = 0;
}

Time::Time(int h,int m)
{
hours = h;
minutes = m;
}

void Time::Addmin(int m)
{
minutes += m;
hours += minutes/60;
minutes %= 60;
}

void Time::Addhou(int h)
{
hours += h;
}

void Time::Reset(int h,int m)
{
hours = h;
minutes = m;
}

Time Time::operator+(const Time & t)const
{
Time sum;
sum.minutes = minutes + t.minutes;
sum.hours = hours + t.hours;
sum.monutes %= 60;
return sum;
}

Time Time::operator-(const Time & t)const
{
Time diff;
int tot1,tot2;
tot1 = t.minutes + 60*t.hours;
tot2 = minutes + 60*hours;
diff.minutes = (tot2-tot1)%60;
diff.hours = (tot2-tot1)/60;
return diff;
}

Time Time::operator*(double mult)const
{
Time result;
long totalminutes = hours * mult * 60 + minutes *mult;
result.hours = totalminutes/60;
result.minutes = totalminutes %60;
return result;
}

std::ostream & operator<<(std::ostream &os,const Time & t)
{
os<<t.hours<<" hours, "<<t.minutes<<
" minutes."<<std::endl;
return os;
}

这是包含main()的文件：

#include <iostream>
#include "mytime3.h"

int main()
{
using std::cout;
using std::endl;

Time aida(3,35);
Time tosca(2,48);
Time temp;

cout <<"Aida and Tosca:/n";
cout <<aida<<tosca;
temp = aida + tosca;
cout <<"Aida+Tosca: "<<temp;
temp = aida * 2;
cout <<"Aida*2: "<<temp;
cout <<"10*tosca: "<<10*tosca;

return 0;
}

哪个给看一下，我用VC++ 9.0编译老出错啊啊，谢谢！