An engine of 4.9kW power is used to pump water from a well which is 20m deep. What quantity of water in kiloliters can it pump out in 30 minutes?
Find the power used in pumping 3425m3 of water per hour from a well 8m deep to the surface, supposing 40 of the hour's power during pumping is wasted. What is the horsepower of the engine?