Midtown Bank always has two tellers on duty. Customers arrive to receive service from a teller at a mean rate of 40 per hour. A teller requires an average of 2 minutes to serve a customer. When both tellers are busy, an arriving customer joins a single line to wait for service. Experience has shown that customers wait in line an average of 1 minute before service begins.
(a) Describe why this is a queueing system.
(b) Determine the basic measures of performance—Wq, W, Lq, and L—for this queueing system.