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+1 vote
89.1k views
in Mathematics by (51.7k points)

The angle of elevation of an aeroplane from a point on the ground is 60º. After a flight of 30 seconds the angle of elevation becomes 30º. If the aeroplane is flying at a constant height of 3000√3m, find the speed of the aeroplane.

1 Answer

+1 vote
by (266k points)
 
Best answer

Let, A be point of observation and P and Q be positions of the plane. Let ABC be the line through and it is given that angles of elevation from point  A to two positions P and Q are 60º and 30º.

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