Slabs of meat $($ dimensions are $0\mathrm{.}3$m$0\mathrm{.}06$m$0\mathrm{.}12$m$)$ are to be frozen in air blast freezen at $-28\mathrm{.}9$C$.$ The heat transfer coefficient is hc$=17$W$($m$.$K$).$ The physical properties are density $=1057$ kg$/$m for the unfrozen meat and K$=1\mathrm{.}038$ W $($ m$.$ K$)$ for the frozen meat. The latent heat of frozen of water to ice is $335$ kj$/$kg water. Calculate the freezing time $($ in hr$)$ using Plank's ewuation. $($use the related chart in order to find P and R$)$

A$)7\mathrm{.}65$

B$)3\mathrm{.}70$

C$)8\mathrm{.}43$

D$)5\mathrm{.}75$

E$)9\mathrm{.}02$