FastFood Haven FastFood Haven, a popular drive-thru restaurant, employs one cashier at their drive-thru window to assist with customer orders. If the cashier is already occupied with another customer, the subsequent vehicles are queued in line. Assume there is no limit to the number of cars that can be in the queue, and no customers drive away due to extended waiting times. On average, a new car arrives at the drive-thru every 4 minutes, and the cashier takes around 3 minutes to complete an order. Both the time between incoming cars and the time for service follow exponential distributions. The drive-thru cashier earns $20 per hour, and the overhead costs for operating the drive-thru amount to $5 per hour. FastFood Haven estimates that every minute a customer spends waiting in the queue costs them $2 due to customer dissatisfaction and the potential for lost future business.

Question 6 - FastFood Haven (continued) On average, how many minutes will a customer spend waiting in line before interacting with the drive-thru cashier? Question 7 - FastFood Haven (continued) What is the average hourly cost for running the drive-thru, including expenses attributed to customer waiting time (in dollars)?