A Bank Is Designing a New Branch Office and Needs

Multiple Choice

A bank is designing a new branch office and needs to determine how much driveway space to allow for cars waiting for drive up teller service.The drive up service will have three tellers and a single waiting line.At another branch of the bank in a similar setting,the average service time for drive up tellers is 4 minutes per customer and average arrival rate is 36 customers per hour.It is expected that the new bank will have similar characteristics. By how much would the average time in the system increase if only two tellers were on duty?

A) approx.4 minutes
B) approx.10 minutes
C) approx.6 minutes
D) The lines would become infinitely long.
E) It is impossible to say without more information.