Multiple choice general knowledge math & puzzles

There are five gears connected in a row, the first one is connected to the second one, the second one is connected to the third one, and so on. How much faster would the last gear be if the second gear was twice the size of the first gear, and all the other gears were the same size as the first gear? Assume that the first gear is rotating at the rate of 50 revolutions per minute(rpm).

  1. 100

  2. 50

  3. 75

  4. None of these
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

In a train of gears, the speed of the last gear relative to the first depends only on the ratio of the first gear's teeth to the last gear's teeth. Intermediate gears (idlers) do not affect the final output speed regardless of their size.

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