Two wattmeter: PE Power Measurement and Instrumentation practice question

A balanced three-phase, three-wire 480 V load draws 75 kW at a power factor of 0.70 lagging. Its power is measured with two wattmeters connected by the two-wattmeter method: current coils in lines a and c, potential coils from those lines to line b.

The lower of the two wattmeter readings is most nearly: