20 cars, 90 passengers, 5 bays. 80 seconds on the clock.
90 waiting
You have 80 seconds, starting at your first tap. A bump costs 3 seconds.
Call the cars to the stop in this order: 6, 1, 9, 4, 15, 3, 5, 19, 7, 10, 18, 13, 8, 11, 14, 2, 16, 17, 20, 12.