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According to the picture: cogwheels A and D have 60 jags each, cogwheel B has 40 jags, and cogwheel C has 20 jags. If cogwheel B turns at 20 RPM, calculate the ratio of A's speed in RPM to D's. cogwheels

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The ratio A/D should be 1 since the rate of jags for both is equal.

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