The Canara Bank drive-in teller window can serve a customer at an average of 4 minutes per customer. Service time has a negative exponential distribution. Customers arrive in their cars at a rate (Poisson distributed) of 12 per hour and form a single waiting line:

1. Determine the average waiting time, the average queue length, and the probability that there is no customer in the system.

2. If Canara Bank decides to open a second drive-in teller window with the same service rate as the first one, how will your answers to part a change?