Civil Service Exam Reviewer · Ratio and Proportion · hard
A gear with 58 teeth rotating at 200 rpm drives a gear with 50 teeth. How fast does the second gear rotate?
- 172.41 rpm
- 232 rpm
- 200 rpm
- 208 rpm
Answer
B. 232 rpm
Solution
Teeth × rpm is the same for meshing gears: 58 × 200 = 50 × N → N = 232 rpm (inverse proportion).
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