A culindrical 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
So, radius of tank = 
Height of tank = 2.1 m
Diameter of pipe = 3.5 cm
So radius of pipe =
Rate of flow of water through pipe = 2 m/s
Suppose the tank is filled in = x minute
So, volume of water flows through pipe in x minute= volume of tank
= 
= 
= 
26