A multi-disc clutch has 3-discs on the driving shaft and 2-discs on the driven shaft. Outside radius of the contact surface is \(180 \mathrm{~mm}\) and inside radius is \(120 \mathrm{~mm}\). Assuming uniform wear and coefficient of friction is 0.3 . Find the maximum axial intensity of pressure between the discs for transmitting \(25 \mathrm{~kW}\) at 1,500 rpm.