QUESTION 2: DRYING [20 MARKS] A batch dryer is used to dry 500 kg of wet porous solid containing 30 percent moisture. It takes 2 hours to remove 40 percent of the initial moisture content. The critical and the equilibrium moisture contents are 0.15 and 0.06 kg H2O/kg dry mass respectively. Assuming the drying surface area is 0.8 m2/kg dry mass, how long will it take to dry a sample of the same solid from 0.3 to 0.1 kg H2O/kg dry mass under the same drying conditions