A belt conveyor (7 ply, 900 mm wide) is to be used to convey ore on a roadway whose gradient is 1 in 10 against the load. If the peak-loading rate is 150 t/h calculate the power required and the maximum permissible length of the conveyor. Belt speed is 1.5 m/s, angle of wrap 2400 , coefficient of friction 0.25, drive efficiency 85% and the mass of moving parts of the conveyor is 75 kg/m. Allow for a maximum belt tension of 5.25 kN/ply/m and an idler friction factor of 0.03