A cylindrical water tank of diameter 2.8 m and height 4.2 m is being fed by a pipe of diameter 7 cm through which water flows at the rate of 4 m/s. Calcuate in minutes the time it takes to fill the tank.

A cylindrical water tank of diameter 1.4 m and height 2.1 m is being fed by a pipe of diameter 3.5 cm through which water flows at the rate of 2 metre per second. In how many time the tank will be filled?

A cylinderical pillar is 50 cm in diameter and 3.5 m in height. Find the cost of white washing the curved surface of the pillar at the rate of Rs 12.50 per m^2 .

Find the ost of painting 12 pillars each of dimeter 48 cm and height 7 m at the rate of Rs.2.50 per m^2 .

A farmer connects a pipe of internal diameter 20 cm from a canal into a cylindrical tank in her field, which is 10 m in diameter and 2m deep.If water flowsthrough the pipe at the rate of 3 km/h, in how much time will the tank be filled ?

The apparent depth of water in cylindrical water tank of diameter 2 R cm is reducing at the rate of x cm //min when water is being drained out at a constant rate .The amount of water drained in c.c. per minute is (mu_(1) = refractive index of air, mu_(2) = refractive index of water)

A cylindrical tank of radius 10 m is being filled with wheat at the rate of 314 cubic metre per hour. Then the depth of the wheat is increasing at the rate of:

A cylinderical pipe has an outer diameter of 1.4 m and an inner diameter of 1.12m. Its length is 10 m. Find the total area to be painted if the rate of painting is Rs. 100 per m^2 .