static void Main(string[] args)
{
Carrera c = new Carrera(5);
Animal p = new Perro(20);
Caballo b = new Caballo("pepe", 22);
c += p;
c += b;
Console.WriteLine(c == p);
Carrera.MostrarCarrera(c);
Console.ReadKey();
}
private void button2_Click(object sender, EventArgs e)
{
richTextBox1.Text = carrera.MostrarCarrera(carrera);
}