Question: Consider the following build-up diagrams for a single-server queueing system (e.g., an ATM machine). The time unit is minute . Assuming FCFS (first-come-first-served), How long
Consider the following build-up diagrams for a single-server queueing system (e.g., an ATM machine). The time unit is minute.

Assuming FCFS (first-come-first-served), How long did the second customer have to wait? Give your answer in minutes.
Note: The second customer refers to the second one to arrive.
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