The correct way two invoke two async methods

UseTwoAsyncMethods.cs

public class Program
{
    public static async Task Main(string[] args)
    {
        Stopwatch timer = Stopwatch.StartNew();
        
        Task a = OperationSlow();
        Task b = OperationFast();

        await Task.Delay(5000);
        
        Console.WriteLine("Main");
        
        await a;
        await b;

        timer.Stop();
        Console.WriteLine(timer.Elapsed.TotalSeconds); // Total seconds is 5!
    }

    public static async Task OperationSlow()
    {
        await Task.Delay(3000);

        Console.WriteLine("Slow");
    }

    public static async Task OperationFast()
    {
        await Task.Delay(500);

        Console.WriteLine("Fast");
    }
}