2. Suppose that a bank has two tellers receiving customers from a single line. Assume that the amount of time a customer is served by a teller is memoryless, and that, on average, the rst teller takes 5 minutes per customer, and the second teller takes 6 minutes per customer. When you arrive, there are 2 customers being served (one by each teller) and three customers in front of you in line. (a) What is the expected amount of time you will wait before being offered service by a teller? (b) What is the expected amount of time you will be at the bank