A two-wheel drive tractor having a total weight of 20 kN is pulling an implement at an actual speed of 3 km.h⁻¹. The ratio of axle power (kW) to dynamic weight (kN) on the rear axle is expressed as 1.79/V, where, V is the theoretical forward speed in km.h⁻¹. During pulling the implement, the weight distribution on the front and rear axles of the tractor is 40% and 60% of the total weight, respectively, with wheel slip 12% and coefficient of net traction 0.42. The tractive efficiency, in %, is _______. (Rounded off to 2 decimal places)