Sorting of mail as an illustration of tandem queues, we consider the flow of mail through a sequence of sorters in a post office.Here the 'customers' are letters and the servers are the mail sorters.If there is a fixed total number of mail sorters, all of whom can sort mail at the same continuous rate at any of the sorting stages and the arrival rate of letters to the first of n sorting stages is given, how should the sorters be distributed among the stages so as to minimize the total letter delay through the n stage.

Assume that we have a total of 4 stages(n=4) and 8 mail sorters. Try three different configurations (e.g.,3, 2 1, 2). What is the total time in system for each configuration? What is the best configuration? (Specify your own interarrival times for letters and service times for sorters)