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You lean your 5 foot long ladder up against the wall. However, a cat decides to...

You lean your 5 foot long ladder up against the wall. However, a cat decides to rub up against the bottom of the ladder, causing it to slide down the wall. If the bottom of the ladder is sliding across the floor at a rate of 1 foot per minute, how fast is the ladder sliding down the wall when it is 3 feet from the ground?

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