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From an aeroplane flying, vertically above a horizontal road, the angels of depression of two consecutive stones on the same side of the aeroplane are observed to be `30^(@)` and `60^(@)` respectively. The height at which the aeroplane is flying in km is

A

`(4)/(sqrt(3))`

B

`(sqrt(3))/(2)`

C

`(2)/(sqrt(3))`

D

2

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The correct Answer is:
B
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