At time t = 0, when the border inspection station was scheduled to open, eight vehicles were already waiting in a queue in front of an inspection booth. Vehicles continued to arrive at a rate of 4 The officer did not start the inspection until t = 4 minutes. When t 24 minutes, the barrier was lifted, and vehicles left at a rate of 7.5 h min' min a. Draw the vehicle arrival and departure curves. b. From the graph, what is the maximum queue length? c. From the graph, what time does the queue disappear?