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A 25-foot ladder is leaning against a house (see figure). The base of the ladder is pulled away from the house at a rate of

A 25-foot ladder is leaning against a house (see figure). The base of the ladder is pulled away from the house at a rate of 2 feet per second. How fast is the top of the ladder moving down the wall when the base is 15 feet, 20 feet, and 24 feet away from the house?

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