A counter-flow heat exchanger is used to cool oil (cp = 2.20 kJ/kg•ºC) from 110ºC to 85ºC at a rate of 0.75 kg/s by cold water (cp = 4.18 kJ/kg•ºC) that enters the heat exchanger at 20ºC at a rate of 0.6 kg/s. If the overall heat transfer coefficient is 800 W/m2•ºC, the heat transfer area of the heat exchanger is
(a) 0.745 m2
(b) 0.760 m2
(c) 0.775 m2
(d) 0.790 m2
(e) 0.805 m2
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