using System;

using System.Threading;

​

public class Program

{

    public static void Main()

    {

        Thread[] pool = new Thread[20];

        int x = 0;

        while(x < 4){

            Random rtm = new Random();

            int tempo = rtm.Next(3,8);

            Thread req = new Thread(() => requisicao(tempo));

            req.Start();

            Thread.Sleep(1000);

            x++;

        }

    }

    public static void requisicao(int tempo){

        Console.WriteLine("Tempo: " + tempo);

    }

​

}