Question

the angle of elevation of an aeroplane from a point on the ground is 60 degree after a flight of 30 seconds the angle of elevation changes to 30 degree if the plane is flying at a constant height of 3000 under root 3 M find the speed of the plane in kilometre per hour​

Answer 1

Answer:

REF.Image

tan60∘=x30003

x=330003=3000m

tan30∘=1/330003=9000m

distance covered = 9000- 3000

= 6000 m.

speed = 306000=200m/s