A man is walking away from the foot of a tower of height 40m at the rate of `4km//hour`.Find the rate at which his distance from the top of the tower is increasing when he is 30m away from the bottom of the tower.

A man is moving away from a tower 41.6m high at the rate of 2m/sec. Find the rate at which the angle of elevation of the top of tower is changing,when he is at a distance of 30m from the foot of the tower.Assume that the eye level of the man is 1.6m from the ground.

A man is moving away from a 40-m high tower at a speed of 2 m/s. Find the rate at which the angle of elevation of the top of the tower is changing when he is at a distance of 30 metres from the foot of the tower. Assume that the eye level of the man is 1.6 m from the ground.

A man is walking at the rate of 6.5km/hr towards the foot of a tower 120m high.At what rate is he approaching the top of the tower when he is 5m away from the tower?

From 40 m away from the foot of a tower , the angle of elevation of the top of the tower is 60^(@) .What is the height of the tower ?

The angle of elevation of the top of a tower of height 100 sqrt(3) m from a point at a distance of 100 m from the foot of the tower on a horizontal plane is

80 m away from the foot of the tower, the angle of elevation of the top of the tower is 60^@ . What is the height (in metres) of the tower?

A man standing 30ms South of a tower of height h walks 60 m to the East and finds the angle of elevation of the top of the tower to 30^(@) . Find h.

At a point 20 m away from the foot of a tower, the angle of elevation of the top of the tower is 30^@ The height of the tower is