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The angle of elevation of a jet plane...

The angle of elevation of a jet plane from a point `A` on the ground is `60o` . After a flight of 30 seconds, the angle of elevation changes to `30o` . If the jet plane is flying at a constant height of `3600sqrt(3)m` , find the speed of the jet plane.

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The correct Answer is:
`:.` Speed of the Jet plane is 864 km/hr.
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