Q$3))//300kg$ of solid containing $35\%$ of moisture is dried under constant condition The initial rate of drying is $0\mathrm{.}3\frac{g}{m^2}s$ and the area of surface drying is $55\frac{m^2}{k}g$ dry solid If the critical moisture content of the material may be taken as $15\%$ and the equilibriur moisture is $3\%.$ Calculate:

$1-$ How long will it take to dry the material to $17\%$ of moisture?

$2-$ How long will it take to dry the material to $5\%$ of moisture? $$

$3-$ If the value of equilibrium moisture wasn't known; how long will it take to dry ur material to $17\%$ of moisture?