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Go Past Three Boats, Turn Left at The Gas Station....

A sloop is bound from the main land of Africa to an island bearing WbN, distant 22 leagues, a current setting NNW 2 1/2 miles an hour. What is the course to arrive at the island in the shortest time, supposing the sloop to sail at the rate of 6 knots an hour; and likewise what time will she take?

Solution: The book gives the answer of "9 1/2 hours by steering S 82o54'W or nearly W1/2S."

Source: Samuel Webber's Mathematics Compiled from the Best Authors, 1808, p. 221 (vol 2).