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A man is standing on the top of a 15 foot ladder, which is leaning against a wall. Somescientific minded joker comes up and starts

A man is standing on the top of a 15 foot ladder, which is leaning against a wall. Somescientific minded joker comes up and starts to pullthe bottom of the ladder away at asteady rate of 6 ft/min. At what rate is the man on the ladder descending if he remainsstanding on the top rung when the bottom of the ladder is 9 ft. from the wall?

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