In a production facility, large plates made of stainless steel (k = 15 W/m•ºC, α = 3.91×10-6 m2/s) of 40 cm thickness are taken out of an oven at a uniform temperature of 750ºC. The plates are placed in a water bath that is kept at a constant temperature of 20ºC with a heat transfer coefficient of 600 W/m2•ºC. The time it takes for the surface temperature of the plates to drop to 120ºC is
(a) 0.6 h
(b) 0.8 h
(c) 1.4 h
(d) 2.6 h
(e) 3.2 h
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