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A child is running on a moving sidewalk in an airport. When she runs against the sidewalk's motion, she travels91ft in13 seconds. When she runs

A child is running on a moving sidewalk in an airport. When she runs against the sidewalk's motion, she travels91ft

in13 seconds. When she runs with the sidewalk's motion, she travels169 ftin the same amount of time. What is the rate of the child on a still sidewalk and what is the rate of the moving sidewalk?

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