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In the given figure AB, CD and EF are th...

In the given figure AB, CD and EF are three towers. The angle of elevation of the top of the tower CD from the top of the tower AB is `60^(@)` and that from EF is `30^(@). BD=2sqrt3m, CD:EF=5:4 and DF=4m`.

A

6 m

B

12 m

C

7 m

D

none of these

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The correct Answer is:
C
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