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We have four gears with below features
=> Both Gear A and D has 60 teeth
=> Gear B has 40 teeth
=> Gear C has 20 teeth
=> Every two minutes, Gear B makes 25 full turns.
What is the relative speed of Gear A and Gear B?
1) 25*40=1000 teeth per 2 min
1000/60= 50/3 turns per 2 min
50/3/25=2/3 relative speed of Gear A vs Gear B
2) simply 40/60= 2/3
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