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Suppose you want to row your boat across a 3-mile-wide river. You can row at a speed of 2.5 mi/h. The current is flowing south at a rate of 1.4 mi/h. At what angle upstream should you aim your boat so that is ends up going straight across?

  • math -

    if x=0 means straight across, you need to go upstream at an angle x where

    sin x = 1.4/2.5

    note that the 3-mile width and southward flow of the water are irrelevant

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