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Speedy Oil provides a single-server automobile oil change and lubrication service

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Speedy Oil provides a single-server automobile oil change and lubrication service. Customers provide an arrival rate of 2.5 cars per hour. The service rate is 5 cars per hour. Assume that arrivals follow a Poisson probability distribution and that service times follow an exponential probability distribution.
c. What is the average time a car spends in the system?