Water flows out through a circular pipe whose internal diameter is 2 cm, at the rate of 6 metres per second into a cylindrical tank, the radius of whose base is 60 cm. Find the rise in the level of water in 30 minutes?
Given,
internal diameter of pipe = 2 cm
internal radius of pipe = 
rate of flow of water = 6 m/s = 600 cm/s
radius of base of cylindrical tank = 60 cm
so,
rise in height in cylindrical tank = 
30