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The angle of elevation of the top of a b...

The angle of elevation of the top of a building from the foot of the tower is `60^(@)`. After a flight of 15 seconds, the angle of elevation changes to `30^(@)`. If the aeroplane is flying at a constant height of `1500sqrt3 `m find the speed of the plane in km/hr.

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The correct Answer is:
720 km/hr
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NAGEEN PRAKASHAN-SOME APPLICATIONS OF TRIGONOMETRY-Exercise
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