What horsepower must be supplied to a pump that operates at an efficiency of 75% to the flow if water (T=25°C) is pumped through the 25-cm wrought iron steel pipe from the lower tank to the upper one at a rate of 0.50 m^3/s? Assume K(entrance)=0.03, K(elbow)=0.35, and K(exit)=1.0.