Hot water flows through a PVC (k= 0.092 W/m · K) pipe whose inner diameter is 2 cm and outer diameter is 2.5 cm. The temperature of the interior surface of this pipe is 50°C and the temperature of the exterior surface is 20°C. The rate of heat transfer per unit of pipe length is
(a) 77.7 W/m
(b) 89.5 W/m
(c) 98.0 W/m
(d) 112 W/m
(e) 168 W/m
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