The angles of elevation of the top of a tower 72 metre high

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SSC CGL Tier-2 21-February-2018 Maths
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The angles of elevation of the top of a tower 72 metre high from the top and bottom of a building are 30° and 60° respectively. What is the height (in metres) of building?

[SSC CGL Tier-2 21-February-2018 Maths]

A 42

B 20√3

C 24√3

D 48