A Bank always has two tellers on duty. Customers arrive to receive service from a teller at a mean 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. The average waiting time is 1 minute. Find measures of performances, W, Lq, L. (18 pts) Use Hint: L=Lq+/, W=L/ , Wq=Lq/