Q 3050280114.     An aeroplane flying horizontally `900 m` above the ground is observed at an elevation ` 60^{0}`. After `10` seconds, the elevation changes to ` 30^{0}`. The uniform speed of the aeroplane (in km/hr) is

A

`120`

B

`180\sqrt{3}`

C

`216\sqrt{3}`

D

`50\sqrt{3}`

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