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An aeroplane is moving one kilometer hig...

An aeroplane is moving one kilometer high from west to east horizontally . From a point on the ground due south the angle of elevation of the aeroplane is `60^(@)`, and after `10` second, the angle of elevation of the aeroplane is observed as `30^(@)` . Then the speed (in m/s)of the bird is

A

`240sqrt(3)km//hr`

B

`485km//hr`

C

`364km//hr`

D

`523km//hr`

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The correct Answer is:
A
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