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OpenStudy (anonymous):
Traveling at full speed on a river, it takes 4 hours for a motorboat to travel 18 miles upstream and 21 miles back downstream. If the current's speed is 2 mph, what is the maximum speed of the boat in still water?
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OpenStudy (adajiamcneal):
5.656854249 miles per hour. if you need the work : http://www.algebra.com/algebra/homework/word/travel/Travel_Word_Problems.faq.question.208387.html
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