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An aeroplane is flying horizontally at a...

An aeroplane is flying horizontally at a height of 1.8km above the ground. The angle of elevation of plane X is `60^@` and after 20 seconds, its angle of elevation from X is become `30^@`.If point X is on ground, then what is the speed (in km/hr) of aeroplane?

A

`216 sqrt3`

B

`105 sqrt3`

C

`201 sqrt3`

D

`305 sqrt3`

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