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A ladder 13m long has its foot on level ground and the top rests against a vertical wall. The foot begins to slip away, from

A ladder 13m long has its foot on level ground and the top rests against a vertical wall. The foot begins to slip away, from the wall at the rate of 0.25 m/min. At what rate is the top slipping down the wall when the foot of the ladder is 5m away from the wall?

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