In a parallel-flow, liquid-to-liquid heat exchanger, the inlet and outlet temperatures of the hot fluid are 150ºC and 90ºC while that of the cold fluid are 30ºC and 70ºC, respectively. For the same overall heat transfer coefficient, the percentage decrease in the surface area of the heat exchanger if counter-flow arrangement is used is
(a) 3.9%
(b) 9.7%
(c) 14.5%
(d) 19.7%
(e) 24.6%
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