Question

A ring-main, 900m long, is supplied at a point A at a p.d. of 220V, At a point B, 240m from A, a load of 45A is drawn from the main, and at a point C, 580m from A, measured in the same direction, a load of 78A is taken from the mam. If the resistance of the main (lead and return) is 0.25Ω per