An oil film of thickness 1.5 mm is used for lubrication between a square plate of size 0.9 m × 0.9 m and an inclined plane having an angle of inclination 20°. The weight of the square plate is 392.4 N, and it slides down the plane with a uniform velocity of 0.2 m/s. The dynamic viscosity (kg/ms) of the oil is _________. (round up to 2 decimals)