A man is walking at the rate of 6.5km/h towards the foot of a tower 120m high. At what rate is he approaching the top of tower when he is 50 m away from the tower ?

A man is moving away from a tower 41.6 m high at the rate of 2 m/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 ladder 13m long leans against a wall. The foot of the ladder is pulled along the ground away from the wall, at the rate of 1.5m/sec. How fast is the angle theta between the ladder and the ground is changing when the foot of the ladder is 12m away from the wall.

A man, 2 m tall, walks at the rate of 1 (2)/(3) m/sec towards a street light which is 5 (1)/(3) m above the ground. At what rate is the tip of his shadow moving? At what rate is the length of the shadow changing when he is 3 (1)/(3) m from the light.

A ladder 5 m long is leaning against a wall. The bottom of the ladder is pulled along the ground, away from the wall, at the rate of 2cm/s. How fast is its height on the wall decreasing when the foot of the ladder is 4 m away from the wall ?

A ladder 5 m long is leaning against a wall. The bottom of the ladder is pulled along the ground, away from the wall, at the rate of 3 cm/sec. How fast is its height on the wall decreasing when the foot of the ladder is 3 m away from the wall?