Abstract Class, C#

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//Rextester.Program.Main is the entry point for your code. Don't change it.
//Compiler version 4.0.30319.17929 for Microsoft (R) .NET Framework 4.5

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

namespace Rextester
{
    public class Program
    {
        public static void Main(string[] args)
        {
            Person person = new Evan();
            person.Eat("Pork");
            person.Talk("Hey their");
            person = new Bob();
            person.Eat("Chicken");
            person.Run(10.3f);
            /*
            output:
            Evan is eating Pork
            Evan: Hey their
            Bob is eating Chicken
            Bob is running at: 10,3 MPH
            */
        }
    }
    public class Evan : Person
    {
        public override void Eat(string food)
        {
            Console.WriteLine("Evan is eating {0}", food);
        }
        
        public override void Run(float speed)
        {
            Console.WriteLine("Evan is running at: {0} MPH", speed);
        }
        
        public override void Talk(string text)
        {
            Console.WriteLine("Evan: {0}", text);
        }
    }
    public class Bob : Person
    {
        public override void Eat(string food)
        {
            Console.WriteLine("Bob is eating {0}", food);
        }
        
        public override void Run(float speed)
        {
            Console.WriteLine("Bob is running at: {0} MPH", speed);
        }
        
        public override void Talk(string text)
        {
            Console.WriteLine("Bob: {0}", text);
        }
    }
    public abstract class Person
    {
        public abstract void Eat(string food);
        
        public abstract void Run(float speed);
        
        public abstract void Talk(string text);
    }
}

Show compiler warnings [ + ] Show input
Compilation time: 0,14 sec, absolute running time: 0,08 sec, cpu time: 0,08 sec, average memory usage: 13 Mb, average nr of threads: 2