It takes 6 hours to dry a wet solid from 50% moisture content to the critical moisture content of 15%. How much longer it will take to dry the solid to 10% moisture content, under the same drying conditions? (The equilibrium moisture content of the solid is 5%) ?
Correct answer: C
Explanation
Drying time is proportional to the change in moisture content. The time from 15% to 10% is calculated based on this ratio.