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October 12, 2010
Solution to a problem posed in her Parade column on 9/26/2,010:
An escalator is 30 steps long. It moves upwards at 1 step per second. A man gets on and walks upwards with the escalator. At the top he notices his wallet on the ground down below. He instantly turns around and walks at the same pace down the up-escalator. It takes him twice as long to get down as it did to get up. What is the man's walking rate?