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A new computer system is put in place at a toll booth. The system comes online at 9.00 am (with no vehicle in the queue), and vehicles arrive at a rate of λ( ) in veh/min and in min). Due to a computer systems failure, cars are not serviced until 9:15 am. Between 9:15 and 9:30 they are serviced at 10 vehicles per minute. After 9:30 am they are serviced at 25 vehicles per minute.
Assuming D/D/1 queueing, which option below best describes the maximum queue length?