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Question

A Ferris wheel is 80 meters in diameter and boarded from a platform that is 2 meters above the ground. The wheel completes one full revolution in 20 minutes. Then its linear velocity is (     ) meters per minute. Round to a whole meter.

Answer 1

The wheel completes a revolution every 20 minutes; i.e., a seat will travel the entire circumference every 20 minutes. The circumference is π times the diameter, which is 80 meters. (Note that the boarding platform being 2 meters from the ground is completely irrelevant to the problem; they just include it to throw you off.) So a seat on the wheel travels 80π meters every 20 minutes, or 4π≈13 meters per minute.