A drive-through at a Fast Food serves 300 customers over a 10-hour day. On average, a customer spends 2 minutes waiting in line, 3 minutes placing the order, and 5 minutes completing the order before leaving the drive-through. How many customers on average are “in” the drive-through (i.e., from the time they enter to the time they exit the drive-through) on a typical day?
a. 30 b.10 c.300 d.5