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OpenStudy (anonymous):
A man stands at point A on the bank of a straight river, 2 mi wide. To reach point B, 7 mi downstream on the opposite bank, he first rows his boat to point P on the opposite bank and then walks the remaining distance x to B. He can row at a speed of 2 mi/h and walk at a speed of 5 mi/h. Find the function that models the time needed for the trip. Where should he land so that he reaches B as soon as possible?
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