Two parallel plates $2$m x $1$m are spaced $1$m apart. The plates are at temperatures of $727$C and $227$C and their emissivities are $0\mathrm{.}3$ and $0\mathrm{.}5$ respectively. The plates are located in a large room, the walls of which are at $27$C$.$ Determine the rate of radiant heat loss from each plate and heat gain by the walls. The surroundings are assumed to be black and no radiation is reflected to the plates.