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Solve the word problem using this 4-step model. (1) Tell what the variable represents, (that is, x = ??); (2) write a rational equation that models the problem; (3) solve the equation for the exact solution ; (4) write your answer in words, labeling units as necessary. Hank bicycles 5 km/hour slower than Kelly. In the time that it takes Hank to bicycle 42 km, Kelly can bicycle 57 km. How fast does each bicyclist travel?

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