A pinion gear with 10 teeth moves along a rack. For every full turn of the pinion, if each tooth advances the rack by 2 centimetres, how far does the rack travel?
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Correct answer to question 162 (Mechanical Comprehension): 20 centimetres
Method
One full turn of the pinion engages all 10 teeth, so the rack advances 10 x 2 = 20 centimetres.
Updated: November 2026
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