A drive gear with 40 teeth turns a driven gear with 10 teeth. If the drive gear turns at 100 rpm, how fast does the driven gear turn?
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Correct!
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Correct answer to question 149 (Mechanical Comprehension): 400 rpm
Method
Speed is inversely proportional to tooth count: 100 x (40/10) = 400 rpm. The smaller gear spins faster.
Updated: November 2026
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