A 12-tooth gear turning at 60 revolutions per minute drives a 24-tooth gear. How fast does the larger gear turn?
Pick an answer
Correct!
Not quite. The correct answer is highlighted.
Correct answer to question 29 (Mechanical Comprehension): 30 revolutions per minute
Method
Multiply the driver's speed by the ratio of the tooth counts: 60 x 12 / 24 = 30 revolutions per minute. Twice the teeth means half the speed.
Updated: November 2026
Raise your AFQT scoreFree for iPhone and Android
