A megaton $($dry weight$)$ of non$-$porous solid is dried under constant drying conditions with an airvelocity of $0\mathrm{.}75$ m$/$s$.$ The area of surface drying is $55$ m$2.$ The critical moisture content of the materialmay be taken as $0\mathrm{.}125$ kg water$/$kg dry solid.i$)$ If the initial rate of drying is $0\mathrm{.}3$ g$/$m$2.$s$,$ then how long will it take to dry the material from $0\mathrm{.}15$to $0\mathrm{.}025$ kg water$/$kg dry solid?