In the balanced three-phase circuit in Figure P16-42, the line impedance is \(Z_{\mathrm{W}}=5+j 30 \Omega /\) phase. The apparent power delivered to the load is \(25 \mathrm{kVA}\) at a lagging power factor of 0.85 . The line current is \(I_{\mathrm{L}}=12 \mathrm{~A}(\mathrm{rms})\). Find the line voltage at the source and complex power produced by the source.