Sewage at a certain pumping station is increased vertically by 5.88 m at the rate of 1 900 000 liters each and every day. The sewage having density 1 050 kg/m3, enters and leaves the pump at atmospheric pressure and via pipes of equivalent diameter.
(i) Determine the output mechanical power of the lift station.
(ii) Suppose an electric motor continuously operating having average power 4.35 kW runs the pump. Determine its efficiency.