A drive pulley with a 6 inch diameter is connected by a belt to a driven pulley with an 18 inch diameter. If the drive pulley spins at 300 rpm, how fast does the driven pulley spin?
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Correct answer to question 155 (Mechanical Comprehension): 100 rpm
Method
Belt-driven pulleys are inversely proportional to diameter: 300 x (6/18) = 100 rpm.
Updated: November 2026
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