A cylindrical tank has a diameter of 3.5m and height of 2.6m. If the water flowing in the tank, flows at a rate of 25 litres per second, how long will it take to fill the tank?
Radius of tank is R = 1.75 m
Height of tank is H = 2.6 m
Vol of tank is V = pi.R^2.H
V = pi*(1.75)^2*2.6
V = 25.015 m^3
Since 1 m^3 = 1,000 litres, then
V = 25,105 litres
Water inflow rate is Vi = 25 litres / second
Time taken to fill tank is: V/Vi = 25, 015 / 25 = 25,000 secs = 416.67 mins = 6 hrs 56 mins 40 secs