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Alice walks on a straight line at four miles per hour. Two hours after she begins walking, Bob runs after her at a rate of six miles per hour. How many hours does it take for Bob to catch up to Alice?
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Answered by
Steve
when Bob starts, Alice is 8 miles ahead.
So, how long will it take Bob to catch up, going 2 mi/hr faster than she?
So, how long will it take Bob to catch up, going 2 mi/hr faster than she?
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