3. A rectangular plain slab of thickness 20 mm has both of its surgaces at 160°c and 120°c the wall has a source which generates heat at a uniform rate of 80MW/m3. If thermal conductibity of slab is k=200 W/mk then
(i) Location of source from 160°c surface ---------mm
(ii) The max temp attain by the slab is ----------°c