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 much time the tank will be filled?
Given,
Diameter of cylindrical tank = 1.4 m
Radius of tank = 
Height of tank =2.1 m
Diameter of pipe flowing water in tank = 3.5 cm
Radius of pipe = 
cm
Rate of flow of water = 2 m/s
so,
Time taken to fill the tank = 
33