An aeroplane flying horizontally , 1km ...

An aeroplane flying horizontally , 1km above the ground , is observed at an elevation of `60^@` ,after 10 seconds , its elevation is observed to be `30^@` . Find the speed of the aeroplane in km/hr.

`240/sqrt(3)`

`200sqrt(3)`

`240sqrt(3)`

`120/sqrt(3)`

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