P$-5$

In a production facility, $1\mathrm{.}2$ in thick, $2ft2ft$ square brass plates and $c_p={0\mathrm{.}091}_{?}Bt\frac{u}{l}bm.F)$ that are initially at a uniform temperature of $75F$ are heated by passing them through an oven at $1300F$ at a rate of $300$ per minute. If the plates remain in the oven until their average temperature rises to $1000F,$ determine the rate of heat transfer to the plates in the furnace.