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Mathematics 15 Online
OpenStudy (anonymous):

Speed of river current is 6mph. Ferry operator is looking to buy new boat. Every day his route takes him 22.5 milses against the current and back to his dock and he needs to make this trip in a total of 9 hours. he has a boat in mind, but he can only test it on a lake where there is no current. How fast must the boat go on the lake inorder for it to serve the ferry operator's needs?

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