A straight pole A subtends a right angle...

A straight pole A subtends 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.

`20sqrt3`

`40sqrt3`

`60sqrt3`

`40/sqrt3`

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