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Mathematics 10 Online
OpenStudy (anonymous):

speed of river current is 6mph. ferry ooperator is looking to buy new boat. every day his route takes him 22.5 miles 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 oonly test it on a lake where there is no current. how fast must the boat go on the lake inoreder for it to serve the ferry operator's needs?

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