Consider a base case where a customer arrives every $40$ seconds and the Customer Service Manager can handle $120$ customers per hour. There are two Food Preparation Managers, each capable of handling $100$ orders per hour.

On average, how many cars do you expect to have waiting in the drive$-$through line? $($Include those waiting to place orders and those waiting for food.$)$ On average, how many cars total would you expect to be in the entire drive$-$through system? $($Include those waiting and those being served.$)$