A simulation process has clearly shown the performance of the sales checkout service of two servers
including their corresponding queues. The simulation was run for 100 hours. The servers are found to be
very busy (99%). The average number of customers waiting in a queue in overall two servers on weekday
is Lq = 67.5812 whereas the waiting time in a queue in overall two servers is approximately Wq = 25.0821
min which is normal time in a very busy server. Such a longer queue can be reduced in size by a decrease
in service time or server utilization. Although interarrival time and mean service time is same for both
servers but there is a small difference in the value of Lq and Wq. This is possible when system has
multiple queues and queues have jockey behavior. In other words, customers tend to switch to a shorter
queue to reduce the waiting time.