A aeroplane is flying horizontally with speed of 432km/hr at higher h meter from ground.Its angle of elevation from a point on ground is `60^(@)` .After 20 sec its angle of elevation from same point is `30^(@)` then the height h is equal to

An aeroplane is flying horizontally at a height of 1.8km above the ground. The angle of elevation of plane X is 60^@ and after 20 seconds, its angle of elevation from X is become 30^@ .If point X is on ground, then what is the speed (in km/hr) of aeroplane?

On the level ground, the angle of elevation of a tower is 30^(@) . On moving 20 m nearer, the angle of elevation is 60^(@) . The height of the tower is

The angle of elevation of an object on a hill from a point on the ground is 30^@ . After walking 120 metres the elevation of the object is 60^@ . The height of the hill is

The angle of elevation of the top of a tower at a point G on the ground is 30^(@) . On walking 20 m towards the tower the angle of elevation becomes 60^(@) . The height of the tower is equal to :

From a point on the ground 20 m away from the foot of a tower the angle of elevation is 60^(@) . What is the height of tower?

The angle of elevation of top of a chimney from a point on ground is 30^(@) . After walking 50 metre towards chimney angle becomes 60^(@) . Then height of chimney is :-

The angle of elevation of the top of a tower at a point on the ground is 30o .What will be the angle of elevation,if the height of the tower is tripled?