(1) There would be 3 queues if the ships join into the each queue before 3 servers separately after the arrival. The arrival ratio for each the queue is 0.9/3 0.3 λ1 = λ2 = λ3 = = , and this moment, the system is 3 subsystems of M/M/1.
(2) If the ships join into a queue after the arrival and berth before the free server for handling, and this moment, the system is a system of M/M/3.
To calculate the efficiency indicators under the conditions of both the queuing modes above respectively, it can be listed as following table shows.