private void Update()
    {
        float timeRemaining = timeTracker.GetTimeRemaining();

        if (timeRemaining != Mathf.Infinity)
        {
            TimeSpan timeSpan = TimeSpan.FromSeconds(timeRemaining);
            timeText.text = String.Format("{0:0}:{1:00}:{2:D2}",
                                          timeSpan.Minutes,
                                          timeSpan.Seconds,
                                          timeSpan.Milliseconds / 10);
        }
        else
        {
            timeText.text = "";
        }
    }