20 cars, 90 passengers, 5 bays. 85 seconds on the clock.
90 waiting
You have 85 seconds, starting at your first tap. A bump costs 3 seconds.
Call the cars to the stop in this order: 18, 7, 20, 15, 9, 5, 19, 2, 14, 1, 3, 8, 17, 12, 13, 16, 10, 11, 4, 6.