The variation of temperature in a plane wall is determined to be T(x) = 110-60x where x is in m and T is in °C. If the thickness of the wall is 0.75 m, the temperature difference between the inner and outer surfaces of the wall is
(a) 30°C
(b) 45°C
(c) 60°C
(d) 75°C
(e) 84°C
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