Реализовать задачу с абстрактными классами - C#

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
 
namespace abstr
{
    abstract class vehile
    {
        public double maxSpeed
        {
            get { return maxSpeed; }
            set { maxSpeed = value; }
        }
        public double carSpeed
        {
            get { return carSpeed; }
            set { carSpeed = value; }
        }
        public double yearConstr
        {
            get { return yearConstr; }
            set { yearConstr = value; }
        }
        public double probeg
        {
            get { return probeg; }
            set { probeg = value; }
        }
        public abstract void SpeedUp();
        public abstract void SpeedDown();
        
    }
    class Car
    {
       }
    class Program
    {
        static void Main(string[] args)
        {
        }
    }
}