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ASVAB · General

A small gear with 10 teeth drives a large gear with 40 teeth. If the small gear rotates at 200 RPM, what is the large gear's speed?

Correct answer

50 RPM

  1. A 25 RPM
  2. B 50 RPM
  3. C 100 RPM
  4. D 800 RPM

Why this is the answer

Gear ratio = driver teeth / driven teeth = 10/40 = 1/4. Large gear speed = 200 × (10/40) = 200 × 0.25 = 50 RPM.
Source: ASVAB MC, Gears

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