PROBLEM:
Gears A and D have 60 teeth each, gear B has 40 teeth, and gear C has 20 teeth.  Suppose that gear B makes twenty complete turns every minute, explain the relative speed of gears A and D?
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SOLUTION:
Gears A and D rotate at the same speed.  Gears of equal size will rotate at constant speeds irrespective of smaller or larger gears in between them
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