A coal seam of \(2.4\ \text{m}\) thickness is mined with a DERD shearer at a cutting speed of \(0.6\ \text{km/h}\). The web depth of the cut is \(0.5\ \text{m}\). The average cross-sectional area of coal on the AFC during transportation is \(0.24\ \text{m}^2\). For the evacuation of cut coal from the face with 10% spillage, the required minimum velocity of the AFC, in \(m\ s^{-1}\), is . (rounded off to two decimal places)