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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?
72 मीटर ऊँचे एक मीनार के शीर्ष का इमारत के ऊपर तथा नीचे उन्नयन कोण क्रमशः `30^@` तथा `60^@` है। इमारत की ऊँचाई (मीटर में) क्या है?

A

A)42

B

B)`20 sqrt3`

C

C)`24 sqrt3`

D

D)48

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