using System;

using System.Collections.Generic;

using System.Linq;

​

class Show

{

    public DateTime Start { get; set; }

    public int Duration { get; set; }

​

    public override string ToString() {

        return string.Format("{0:HHmm} {1:HHmm}", Start, Start.AddMinutes(Duration));

    }

}

​

public class Program

{

    static Random _r = new Random();

​

    public static void Main(string[] args) {

        TimeTable().Take(_r.Next(5, 15)).OrderBy(s => s.Start).ThenBy(s => s.Duration).ToList().ForEach(Console.WriteLine);

    }

​

    static IEnumerable<Show> TimeTable() {

        while (true)

        {

            yield return new Show

            {

                Start = new DateTime(1995, 9, 28, 15, 30, 0).AddMinutes(5 * _r.Next(18)),

                Duration = 5 * _r.Next(4, 12)

            };

        }

    }

}

​