A gear with 20 teeth turns at 600 revolutions per minute and drives a gear with 40 teeth. At what speed does the second gear turn?
Answer and explanation
Correct answer: B. 300 rpm
- Step 1: The speeds are inversely proportional to the numbers of teeth. Step 2. 600 x 20 / 40 = 300 rpm. Answer: 300 rpm. Why not the others: 1200 rpm: the ratio of the teeth was inverted. 580 rpm: the numbers were added and subtracted. 4800 rpm: the quantities were multiplied.
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