A Visit to the Motion Gallery
At a science museum, Nia visits an exhibit with two motorized model trains. A blue train travels on a straight, 90-centimeter track. A green train travels on a separate, straight, 200-centimeter track. Each track has a measuring strip beside it. The 0-centimeter mark is at the left end. Larger numbers are farther to the right.
A museum worker starts each train with its front at 0 centimeters. Nia uses a timer and records the position of each train's front every 2 seconds. She always reads the front, not the middle or the back. She watches from outside a clear cover and does not touch the trains.
The worker leaves each train's program unchanged while Nia watches. The blue train is programmed to make the same trip again and again. The green train uses a different program. Nia records one full blue trip and the first few green readings. For predictions on this sheet, suppose each train continues its recorded pattern without a new stop or a change in its program.