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A moving sidewalk in the Atlanta airport moves people between gates. It takes Molly's 8-year-old son Stephen 10 sec to travel 80 ft walking with the sidewalk. It takes him 40 sec to travel 120 ft walking against the moving sidewalk (in the opposite direction). Find the speed of the moving sidewalk and Stephen's walking speed on nonmoving ground. Express numbers in decimal form rounded to one decimal place.

Sagot :

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