An aeroplane flying horizontally 1 km ab...

An aeroplane flying horizontally 1 km above the ground is observed at an elevation of `60^(@)`. After a flight of 10 seconds, its angle of elevation is observed to be `30^(@)` from the same point on the ground. Find the speed of the aeroplane.

415.7 km /h

215.3 km/h

700 km/h

none of the above

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