Question: A fast food restaurant has one drive-through window. An average of 40 costumers per hour arrive at the window. It takes an average of 1

A fast food restaurant has one drive-through window. An average of 40 costumers per hour arrive at the window. It takes an average of 1 minute to serve a costumer. Assume that interarrival and service times are exponential.

Suppose that 80% of the customers buy double patty burger which takes 3 minutes to prepare and the remaining 20% prefers single patty requiring 1 minutes. Assume that costumers have same arrival rate that is given above and interarrival times and service times are exponential.

i. On the average, how many customers are waiting in line?

ii. On the average, how long does a costumer spend at restaurant (from time to arrival to service to be completed)?

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