The angles of elevation of the top of a tower from two point

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2016 SSC CGL 10 Sep Evening Shift
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The angles of elevation of the top of a tower from two points at a distance of 4 m and 9 m from the base of the tower and in the same straight line with it are complementary. The height of the tower is

[2016 SSC CGL 10 Sep Evening Shift]

A 4 m

B 7 m

C 9 m

D 6 m