For part A i need an expression for the rate of the constant period and an expression for the rate of the falling period, ie Nc = ... and Nf = ... . for part B i need expressions for tc and td then an overall time expression. please show every step especially when integrating.

Q2 A batch of solids need to be dried from 30 to 15% moisture content (on a wet basis) whose characteristic drying curve is shown below. A) Establish expression/expressions for the rate of drying over the entire drying regime, using the data given below. Show the appropriate reasoning. [10 marks) B) Evaluate an expression for the time taken for drying the sample, and calculate the time taken for drying, given the following data. [15 marks] C) The Initial weight of the wet solid is 1000 kg, and the unit surface area is 0.02 m-/kg of dry weight of the sample. 04 Folling tote Constant role Initial adjust ment 03 Internal movement of moisture controls Unsaturated surface drying N = rote of drying, 10 kg evaporated/ms 02 0.1 01 0.2 kg moisture /ho dry sold Total 25 marks