A straight pole A subtend a right angle ...

A straight pole A subtend a right angle at a point B of another pole at a distance of `30` metres from A the top of A being `60^(@)` above the horizontal line joining the point B to the pole A. The length of the pole A is in metres.

`20sqrt(3)`

`40sqrt(3)`

`60sqrt(3)`

`(40)/(sqrt(3))`

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