The second proposal is to have a single waiting line system. All guests could be joined to a single waiting line to be served by whichever of five clerks became available. This option would require sufficient lobby space for what could be a substantial queue. Arrival rate = 90 guests per hour. It would take an average of 3 minutes for the front desk clerk to register each guest. The second proposal is to have a single waiting line system. All guests could be joined to a single waiting line to be served by whichever of five clerks became available. This option would require sufficient lobby space for what could be a substantial queue. Arrival rate = 90 guests per hour. It would take an average of 3 minutes for the front desk clerk to register each guest