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Question 3. [Note: Please circle your answer clearly.] (1) The average number of customers waiting in line during the lunch hour is 10 at Hang Seng Bank's HKUST branch. On average, during this period, 0.5 customers per minute leave the bank after receiving service. On average, how long does a customer wait in the bank? 2 minutes 5 minutes The "work-in-process" inventory (in this case, customers waiting in line) is: L = 10 customers "Throughput rate" = 0.5 customers/minute Therefore, "flow time" W = 10/0.5 = 20 minutes Note: when applying Little's Law, not only can we apply it to the entire system (e.g. from the moment of arrival until departure), but also to a sub-system (similar to the Consultant practice question) and in this problem, the "sub-system is the waiting area. Since everyone who comes in will eventually leave, the throughput rate that coming out of the bank is equal to the output rate that leaves the queue