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The angle of elevation of a jet plane fr...

The angle of elevation of a jet plane from a point A on the ground is `60^(@)`. After a flight of 15 seconds, the angle of elevation changes to `30^(@)`. If the jet plane is flying at a constant height of `1500 sqrt(3)` meter, find the speed of the jet plane. `(sqrt(3) - 1.732)`

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