Question: Suppose a coffee shop ordering and fulfillment process is a 2-stage queuing system. In stage 1, the customer waits in line and then places an

Suppose a coffee shop ordering and fulfillment process is a 2-stage queuing system. In stage 1, the customer waits in line and then places an order for a beverage and any desired food. In stage 2 the order is prepared and served (order fulfilled), while the customer waits. Suppose that an average of 10 customers per hour enter the coffee shop. In the entire 2-stage ordering and fulfillment process, there are an average of 5 customers in total at any time. The average time to take a customer's order is 1 minute, and customers usually wait an average of 4 minutes for their order to fulfilled. Which of the following statements are true assuming the coffee shop ordering and fulfillment system is in steady-state?

a. Wait times to place an order are 25 minutes.

b. Wait times to place an order are 30 minutes.

c. The service rate is 10 customer per hour.

d. On average a customer arrives every 5 minutes.

e. Exactly two answers are correct.

f. None of the answers are correct.

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