Hot water (c = 4.179 kJ/kg•K) flows through a 80 m long PVC (k = 0.092 W/m•K) pipe whose inner diameter is 2 cm and outer diameter is 2.5 cm at a rate of 1 kg/s, entering at 40°C. If the entire interior surface of this pipe is maintained at 35oC and the entire exterior surface at 20oC, the outlet temperature of water is
(a) 35oC
(b) 36oC
(c) 37oC
(d) 38oC
(e) 39°C
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