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The angle of elevation of an aeroplane from a point on the ground is `60^@`. After flying for 30 seconds, the angle of elevation changes to `30^@`. If the aeroplane is flying at a height of 4500 m,then what is the speed (in m/s) of aeroplane?
मैदान पर एक बिन्दु से एक हवाई जहाज का उन्नयन कोण `60^@` है। 30 सेकण्ड उड़ने के पश्चात कोण `30^@` में परिवर्तित हो जाता हे। यदि हवाई जहाज 4500 मी. की ऊँचाई पर उड़ रहा है, तो हवाई जहाज की गति (मी./से. में) क्या है?

A

`50 sqrt3`

B

`100 sqrt3`

C

`200 sqrt3`

D

`300 sqrt3`

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