questions 1,2,3,4 has been posted separately. need solution asap

Problem 1: Tri-Cities Bank is planning to open drive-in teller service. Customers arrive randomly at the drive-in window, whose average inter-arrival time is 2 minutes. Assume the service provided at the drive-in window follows an exponential distribution. (Hint: use the excel template posted online for calculation) Compute the following operating characteristics for each alternative of the four service alternatives are being considered below: (a) Average number of cars waiting for service. (b) Average time a car waits for service. (c) Average time in the system. (d) Average number of cars in the system. (5) If the manager finds out the resulted waiting time in alternative(1) is unacceptable. Among service alternative (2),(3) and (4), which option should the manager choose? And why? (20 points)