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The angle of elevation of an aeroplane f...

The angle of elevation of an aeroplane from a point on the ground is `60^(@)`. After a flight of 30 seconds the angle of elevation becomes `30^(@)`. If the aeroplane is flying at a constant height of 3000 `sqrt(3)` m. Find the speed of the aeroplane.

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The correct Answer is:
720 km / hr
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