A 250 mm wide strip is reduced in one pass between the two driven rolls of Figure 5. Take the projected contact length L = √(RΔh), the roll force F = (average flow stress) × (width) × L, and the roll force acting at L/2 from the line of centres (torque per roll = F·L/2). Determine (a) the maximum possible draft for the given coefficient of friction (in mm), (b) the roll force (in kN) and (c) the total power required to drive both rolls (in kW).