probability

When you enter the bank, you find that there are only two tellers, both busy serving other customers, and that there are no other customers in queue. Assume that the service times for you and for each of the customers being served are independent identically distributed exponential random variables, with parameter λ=1. What is the expected time from your arrival until you and the other two customers are all finished being served?

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  1. Answer is 2

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