19 Direction of the man to reach his destination as soon as possible

Route plan of a man on an island to a point on the straight shoreProblem 19
A man on an island a miles south of a straight beach wishes to reach a point on shore b miles east of his present position. If he can row r miles per hour and walk w miles per hour, in what direction should he row, to reach his destination as soon as possible? See Fig. 57.
 

 

Solution 19

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