A solar-powered pump is used to lift 1200 kg of water vertically upwards through a height of 35 m from an underground source.
The electrical power supplied to the pump's motor is 1600 W, and the motor operates at an efficiency of 75%.
Taking g=9.8 m s−2g = 9.8\text{ m s}^{-2}g=9.8 m s−2, calculate the time taken to pump this quantity of water.