A double acting duplex with 6.5" liners, 2.5" rods, 18" stroke was operated at 3000 psig, 20 cycle/min for 10 minutes with section pit isolated from return mud flow. The mud level in the section put which is 7 ft wide and 20 ft long was observed to fall 18" during this period. Compute the pump factor, volumetric pump efficiency, hydraulic horsepower developed by pump.