Question: A bank uses 3-channel single-phase queue system. Suppose that each customer on average spends 20 minutes in a bank. When the average service time is

A bank uses 3-channel single-phase queue system. Suppose that each customer on average spends 20 minutes in a bank. When the average service time is 5 minutes, what is the average time customer needs to spend in line?

		5 minutes
		10 minutes
		15 minutes
		20 minutes
		Cannot be determined with the provided information

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