Harry and Larry Have Opened Up an Automated Carwash near the Edge

Essay

Harry and Larry have opened up an automated carwash near the edge of town.There is a single service lane, and cars line up in asingle line to enter the carwash.No special services are offered,and the time required for each vehicle to go through the facility is exactly three minutes.Throughout the day, customers arrive
independently and largely at random at an average rate of twelve per hour.Because of the location, even when the queue is full,potential customers may line up in the adjacent side street.
A.What percentage of time is the carwash idle?
B.What is the average number of waiting vehicles?
C.What will be the average elapsed time between when a vehicle enters and leaves the system?
D.What percentage of time is the carwash idle?
E.What is the average number of waiting vehicles?
F.What will be the average elapsed time between when a vehicle enters and leaves the system?