A lamp is on the top of a lamp post of height 2a metres situated on a straight road. A boy of height a metre walks towards the post at the speed of c metre/minute. Find the rate of decrease of the lengh of his shadow.

A lamp is on the top of the lamp post of height 2a metres situated on a straight road. A boy of height a metre walks towards the post of the speed of c metre/minute. Find the rate of decrease of the shadow.

A man of height 2 metres walks at a uniform speed of 5 km/h away from a lamp post which is 6 metres high. Find the rate at which the length of his shadow increases.

A 5 ft long man walks away from the foot of a 12 1/2 ft high lamp post at the rate of 3 mile/h. Find the rate at which his shadow is increasing.

A man 6 ft tall walks away from the foot of a lamp-post 15 ft high at the rate of 3 mi/h how fast does the tip of his shadow move?

As seen from the deck of a ship the angle of elevations of the top and bottom of light house situated on the seaside are 60^@ and 30^@ . If the lgiht house is located 8 metre above the sea level and the deck of the ship[ is at a height of 3 metre from sea level, then what is the height of the light house?

A girl of height 90 cm is walking away from the base of a lamp post at a speed of 1.2 m/sec. If the lamp post is 3.6m above the ground, find the length of her shadow after 4 seconds.

A 5 ft long walks away from the foot of a 12(1)/(2)ft high lamp-post at the rate of 3 mi/h. find the rate at which his shadow is increasing.

To a person standing at the middle point of the horizontal straight line joining the feet of two vertical posts of the same height, the angle of elevation of the top of each post appears to be 30^@ . After walking 40metres towards one of them , the person observes that the angle of elevation of the top of the same post has changed to 60^@ . Find the distance between the two posts.

A man 6 ft tall walks away from the foot of a lamp-post 15 ft high at the rate of 3 mi/h How fast does his shadow lengthen?

The heights of two towers are 210 metres and 70 metres respectively. If the angle of elevation of the top of the first twoere form the bottom of the second tower be 60^@ , then find the angle of elevation of the top of the scecond tower from the bottom of the first tower.