A local department of motor vehicles has an automated photographic machine that imprints the photographic image on to the license card including the lamination of the complete card. Drivers arrive at the photographic machine according to a Poisson distribution at an average rate of 12 per hour. The machine takes a constant 4 minutes to print and laminate a complete license.

Determine:

1. The average number of drivers waiting in line for the machine

2. The average time a driver spends in the system (waiting in line plus the service)