it's a Mass transfer 2 numerical based problem please solve it

3. A sample of porous, manufactured sheet material was dried from both sides by cross-circulation drying. The sample was 0.3m square and 6mm thick, and the edges were sealed. The air velocity over the surface is 3m/s, its dry bulb temperature was 52C and wet bulb temperature 21C. The solid lost moisture at a constant rate of 7.5 105kg/s until critical moisture content 15% (wet basis) was reached. In the falling rate period, rate of evaporation fell linearly with moisture content until the sample was dry. The equilibrium moisture is negligible. The dry weight of the sheet is 1.8kg. Latent heat of vaporization of moisture is 2435kJ/kg, density of gas 1.2kg/m3. Assume heat transfer by conduction and radiation is negligible. Estimate the time of drying sheets of this material 0.6 by 1.2m by 12mm thick from both sides from 25 to 2% moisture(wet basis) using air of dry bulb 66C of the same absolute humidity (27C wet bulb temperature ) at a linear velocity over the sheet of 5m/s. Assume no change in critical moisture content with the changed drying conditions. 6