关于c＃：找不到合适的方法来覆盖。

No suitable method found was found to override. Why does VS keep telling me this error?

这是我的密码…

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using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace Computer_Science_Student
{
class CompSciStudent : Student
{
private double MATH_HOURS = 20;
private double CS_HOURS = 40;
private double GEN_HOURS = 60;

private string _academicTrack;

public CompSciStudent(string name, string id, string track)
: base(name, id)
{
_academicTrack = track;
}

public string AcademdicTrack
{
get { return _academicTrack; }
set { _academicTrack = value; }
}

public override double RequiredHours
{
get { return MATH_HOURS + CS_HOURS + GEN_HOURS; }
}
}
}

我不太熟悉覆盖，所以我不确定这里出了什么问题。有什么想法吗？实际的错误发生在第28行(公共覆盖需要两个小时)，但我感觉这与程序的第16行有关。

编辑：

学生班：

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using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace Computer_Science_Student
{
abstract class Student
{
private string _name;
private string _id;

public Student(string name, string id)
{
_name = name;
_id = id;
}

public string Name
{
get { return _name; }
set { _name = value; }
}

public string ID
{
get { return _id; }
set { _id = value; }
}

public abstract double RequiredhOurs
{
get;
}
}
}

现在程序仍在说没有合适的重写方法，"compsciestudent"不实现继承的抽象成员student.requiredhours.get"computer science student"。