Q 3060891715.     An aeroplane flying horizontally `1` km above the ground is observed at an elevation of `60^{0}`. If after `10` secs the elevation is observed to be `30^{0}`. Then the uniform speed per hour the aeroplane is

A

`20\sqrt{3}\ km`

B

`240\sqrt{3}\ km`

C

`256\sqrt{3}\ km`

D

`250\sqrt{3}\ km`

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