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If two towers of height X and Y subtend ...

If two towers of height X and Y subtend angles of `30^(@)" and "60^(@)` respectively at the centre of the line joining their feet, then X:Y is equal to

A

`1 : 3`

B

`1 : sqrt 3`

C

`3 : 1`

D

`sqrt 3 : 1`

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