A man on a wharf 40 metres above the water pulls in a rope, attached to a boat, at the rate of `3 m//sec`. When there is still 50 metres of rope out, the boat is approaching the shore at the rate of

A man on the tower 15 metres above the water pulls in a rope, attached to a boat, at the rate of 0.8m//sec .When the boat is 8 m from the tower, it is approaching the river bank at the rate of

A man on a wharf 20 mt above the water level, pulls in a rope to which a boat is attached, at the rate of 4 mt per second. At what rate is the boat approaching the shore, when there is still 25 mt of rope out.

A ladder 17 metre long is leaning against the wall. The base of the ladder is pulled away from the wall at a rate of 5m/s. When the base of the ladder is 8 metres from the wall. At what rate, the area of the triangle formed by the ladder, wall, and the floor, is changing?

A man of height 1.8 metre is moving away from a lamp post at the rate of 1.2m//sec . If the height of the lamp post be 4.5 metre, then the rate at which the shadow of the man is lengthening is

A stone dropped into a pond of still water sends out concentric circular waves of water , from the point of disturbance, at the rate of 50 cm/sec. When the radius of the wave-ring is 75 metres, the rate of increase of its circumference and area are respectively

When the speed of a boat in still water is 4 km/h and the rate of stream is 2 km/h, find upstream speed of the boat

A water tank has the shape of an invertd circular cone with base radius 2 metres and height 4 metres. If water is being pumped into the tank at the rate of 2m^(3)//mm . Find the rate at which the water level is rising when the water is 3m deep

A ladder is inclined to a wall making an angle of 30 with it.A man is ascending the ladder at the rate of 3m/sec. How fast is he approaching the wall?