Evaluations for input

The pump-turbine system in Fig. P3.135 draws water from the upper reservoir in the daytime to produce power for a city. At night, it pumps water from lower to upper reservoirs to restore the situation. For a design flow rate of 15,000 gal/min in either direction, the friction head loss is 17 ft. Estimate the power in kW extracted by the turbine. <image 1>

(A) 540 hp

(B) 334 hp

(C) 410 hp

Answer with the option's letter from the given choices directly. No punctuation.