Consider a fast-food restaurant where customers enter at a rate of 75 per hour, and three servers are working. Customers wait in a single line and go, in FCFS fashion, to the first of the three servers who is available. Each server can serve one customer every two minutes on average. If you are standing at the exit, counting customers as they leave the restaurant, at what rate will you see them leave? On average, how many of the servers are busy?