A convenience store has two counters: one for quick food (such as sandwiches, donuts, and muffins), the other for drinks. Each counter serves its customers completely separately. The Food counter has 4 employees working independently to process customer orders (i.e. a customer is served by a single employee from start to finish). Each food order often takes an employee 2.4 minutes to fill on average. There is another employee working at the Drink counter by herself. It usually takes her 1.2 minute to serve one drink customer. The peak hour of the day is form 7 8 AM, when 140 customers typically arrive in that hour. Among them, 65% are usually for food, and 35% are for