1. During the afternoon peak hours the First Bank of Dubuque has an average of 40 customers arriving every hour. There is also an average of 8 customers at First Bank at any time. The probability of the arrival distribution is unknown. How long does the average customer spend in the bank?

2. An average of 9 cars can be seen in the system (both the drive-through line and the drive-through window) at Burger Universe. Approximately every 20 seconds, a car attempts to enter the drive-through line; however, 40% of cars simply leave the restaurant because they’re discouraged by the length of the line. On average, how long does a car spend going through the drive-through at Burger Universe?