Security Check point 1

There is only one TSA officer at Security Check Point 1. A passenger presents her ID and boarding pass to the TSA officer. The TSA officer checks the ID and puts a stamp on the boarding pass. It takes 60 seconds on average for the officer to process one passenger, and service (process) times are exponentially distributed. Passengers arrive according to a Poisson process. To go through Security Check Point 1 on average takes 4 minutes (This includes waiting time and process time).

Security Check point 2

Then each passenger has to take the automated X-ray machine.1It takes 2 minutes on average to scan (process) one passenger. There is only one X-ray scanner at Security Check point 2. The airport administration estimates that on average there are 6 passengers at Security Check Point 2 (This includes those who are waiting in line and those who are being scanned).