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Mathematics 9 Online
OpenStudy (anonymous):

A boat can travel at a constant rate of 15 miles per hour in still water. The total time taken to go upstream and return to the starting point is given by the function t = 60/15 - c + 60/15 + c , where c represents the speed of the current. If the speed of the current is 5 miles per hour, how many hours will the boat take to complete the trip?

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