A double-acting duplex pump with 6.5 in liners, 2.5 in rods, and 18 in stokes was operated at 2000 psig and 20 cycles/min for 10 minutes with suction pit isolated from return and mud flow. Mud level in suction pit is 7 ft wide and 20 ft long and fell 18 in during this period. Compute the pump fact, volumetric pump efficiency and hydraulic horsepower developed by pump?