Answer to Question #99931 in Classical Mechanics for Kiv

Question

A man walks with speed of 3 m/s when he walks on hard ground. He
has speed of 1 m/s when he walks on sand. He is standing at the boarder
between sand and hard ground. To reach a rest house he needs to walk 30
m along boarder and 36 m perpendicular to it. Find a path which takes
minimum time to reach the rest house.

Answer 1

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