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Mathematics 8 Online
OpenStudy (anonymous):

A child is running on a moving sidewalk in an airport. When he runs against the sidwalk's motion, he travels 84 ft in 14 seconds. When he runs with the sidewalk's motion, he travels 70 ft in 7 seconds. What is the rate of the child on a still sidwalk and what is the rate of the child on a moving sidewalk?

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