A ladder 25 feet long is leaning against a wall of a house. The base of the ladder is pulled away from the wall at the rate of 2 ft/s. How fast is the top of the ladder moving down when its base is 7 feet from the wall? A. 5/12 ft/s C. 7/13 ft/s B. 5/13 ft/s D. 7/12 ft/s

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