- Let A= {a,b,c,d,e,f,g,x,y,z}, b= {1,2,c,d,e}and c={d,e,f,g,2,y}. Verify A -(
The angle of elevation of an aeroplane from a point on the ground is 60° .After a flight of 30 sec the angle of elevation becomes 30°. If the aeroplane is flying at a constant height of 3000√3 m, find the speed of the aeroplane.