Problem: In a typical Starbucks, labor is divided into two activities: cashiers take orders and collect payment, and baristas make drinks. (For the purposes of this question, we will ignore any food preparation activities.) Customers must first visit the cashiers and then proceed to the baristas. A process flow diagram is depicted below: Startbucks Process Flow Diagram Consider a particular Starbucks location with 2 cashiers and 3 baristas working at all times. Suppose a cashier spends an average of 60 seconds processing each customer while a barista spends an average of 45 seconds making each drink in the customer's order. The average customer orders 1.75 drinks (that is, some customers order only one drink, while others order multiple drinks).