In a meat processing plant, 2-cm-thick steaks ( $k=$ $0.45 \mathrm{~W} / \mathrm{m} \cdot{ }^{\circ} \mathrm{C}$ and $\alpha=0.91 \times 10^{-7} \mathrm{~m}^2 / \mathrm{s}$ ) that are initially at $25^{\circ} \mathrm{C}$ are to be cooled by passing them through a refrigeration room at $-11^{\circ} \mathrm{C}$. The heat transfer coefficient on both sides of the steaks is $9 \mathrm{~W} / \mathrm{m}^2,{ }^{\circ} \mathrm{C}$. If both surfaces of the steaks are to be cooled to $2^{\circ} \mathrm{C}$, determine how long the steaks should be kept in the refrigeration room.