public abstract class Car
{

    protected double x = 10;
    protected double y = 10;
    private string Gas = string.empty;
    protected Car(){  }

    protected Car(double x, double y,string strGas)

    {

        this.x = x;
        this.y = y;
        this.Gas = strGas;

    }

    public abstract int Speed();

 }




 public  class TOYOTA : Car
 {
    public TOYOTA(){ }
    public override int Speed()
    {
        return x * y;
    }
}



public  class HONDA : Car
{

    public HONDA(double x, double y): base(x, y) 
    {

    }

    public override int Speed()
    {
         return x * y;
    }
}

static void Main(string[] args)
{
   TOYOTA T = new TOYOTA();
   int nToyotaSpeed = T.Speed();

   HONDA H = new HONDA(10,5);
   iny nHondaSpeed = H.Speed();
}