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A vending machine at city airport dispenses hot coffee, hot chocolate, or hot tea in a constant service time of 2 0 seconds, Customers arrive

A vending machine at city airport dispenses hot coffee, hot chocolate, or hot tea in a constant service time of $20$ seconds, Customers arrive at the vending machine at a mean rate of $60$ per hour $($ poisson distrubuted $) .$ Determine the average length of the waiting line and the average time a customer must wait. Th

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