step by step , and solve in graph

the Question below the graph

Fig Q3 shows the drying graph of a solid. The drying happens from 25% moisture to 6% (wet base). If the ratio of the mass of dry solid to the wet surface which is in contact with the gas be 40kg/m2. Fig. Q3 a. Calculate required time for drying of the solid? [15 Marks] b. Explain your answer. [ 5 Marks] t=ARCLS(X1X2)t=ARCLsXClnX2XCt=A(R1R2)L5(X1X2)hR2R1RC=Asq=kh(TTH)=kyMM(HHH)