1.

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.

Answer»

6 m
12 m
7 m
none of the above

Answer :C


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