Question 445533
A boat heads directly across a river at 8 mi/h. The river flows downstream at 10 mi/h. Find the resulting speed and direction of the boat.
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The direction of the boat wrt its heading is arctan(10/8)
=~ 51 degs
That is, if the boat heads directly across, its path makes an angle of 51 degs with the line perpendicular to the shore.