Automobile Waiting

Automobiles arrive at the drive through window at the downtown Urbana, Illinois post office at the rate of 4 every ten minutes. The average service time is 2.0minutes. The Poisson distribution is appropriate for the arrival rate and service times are exponentially distributed.

h) If a second drive-through window, with its own server were added, the average time a car is in the system is ? (To two decimal places)


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