Please solve in detail of mass transfer

Q2. A rectmagular wooden section has dimensions - if x111 inches. A stream of dry air passed over the noxd to lower its moisture. content. Only the two large faces are expased to the dy air on the surface a constare moisture contens of 6 wt\% existe. When tr hr of dying hive elapsed the moistue contene of the center drops from 16 to 9kri. Using the sime initial moisture content calculare the time reguired to seduce the moisine Gomtew at the center from 16 to 94t/ in the folburing 6(1) oluechr Sonstruched of idertical woad and dried in simitar conditions. Assume that the convective mass transfor Cexfficient is great enougin so that the relative resistanle is nealigible: - a) A solid sphere with a diametir if 5 inches. b) A salid culinder with both ands covered to preveat oiz5s trmafor. The lenyib is 12 inches and the diameter is 10 incl