q2 pls help

(a) A material is to be dried and has an initial moisture content of 90% to a final content of 10%. If the critical moisture content is 55% and the equilibrium moisture content is 6% (at dryer condition), calculate the saving in drying time if the material is dried to 16% instead of 10%. All other drying conditions remain the same. All moisture contents are on the wet basis. [6] (b) Calculate the partial pressure and specific humidity of air if it relative humidity at 300K and one atm is 70% and if saturated vapor pressure of water at 300K is 0.2463atm. [4]