Question: A single-server queue has random arrivals at a rate of 30 an hour and random service times at a rate of 40 an hour. If

A single-server queue has random arrivals at a rate of 30 an hour and random service times at a rate of 40 an hour. If it costs £20 for each hour a customer spends in the system and £40 for each hour of service time, how much does the queue cost?

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