please I need to answer it ,, its quantitative course

thank you

4. A hotel is considering changing its waiting line system. In the current system, hotel guests divide themselves equally between the lines that form in front of 3 hotel clerks. The manager is considering having hotel guests wait in one line and then proceed to the next available clerk. If average service time is 6 minutes and the average number of arrivals per hour is 24 guests. Which system do you propose