The angle of elevation of an aeroplane from a point on the ground is 60 deg After 15 seconds flight ...........

Quantitative Aptitude ( CCS) Trignometry

The angle of elevation of an aeroplane from a point on the ground is 60°. After 15 seconds flight, the elevation changes to 30°. If the aeroplane is flying at a height of 1500√3 m, find the speed of the plane.

300 m/sec

200 m/sec

100 m/sec

150 m/sec

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Explanation:

Given, the height of the aeroplane, BC = 1500 √3 meter
Let, an aeroplane travelled distance BD = x metre in 15 seconds.
And, AC = y metre
∴ AE = CE + AC = (x + y) m
In ΔABC,