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

Explanation

Radius =R=`1.4//2`=`0.7 m`
Height=H=`2.1`=`21//10 m`
considerd the cylindrical pipe:
Diameter=`3.5 cm`=`7//2 xxcm`
radius =r=`7//4xxcm`=`7//400 xxm`
speed = h =`2 m//s`
Therefore, time Taken to fill the tank=Volume of cylindrical tank//Volume of cylindrical pipe
=`piR^2H//pir^2h`
=`7//10xx7//10xx21//10-:400//7xx400xx7xx1//2`
=`1680 secs`
=`28 min`