JEE Advanced Mathematics question
A vertical wall running from south to north has the height . A policeman of height is standing in front of the wall at a distance from it on the eastern side. What should be the maximum distance of a crawling thief from the wall so that the thief can hide from the view of the policeman if the thief is on the other side of the wall in the west of the policeman?
Answer: (A)
Solution
*(Figure: policeman of height at distance east of the wall of height ; the line of sight from the eye grazing the top of the wall meets the ground at on the west side, .)*
The thief (crawling, height ≈
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