I Think you have to use the equation for convection, dH/dt=(h)(A)(change in temp

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I Think you have to use the equation for convection, dH/dt=(h)(A)(change in temp), when h=0.0412.

Note, the answer is 174.76 hectares,  

A cooling water pond is to be constructed for a power plant that discharges 17.2 m3 . s-1 of cooling water. Estimate the required surface area of the pond if the water temperature is to be lowered from 45.0 degree C at its inlet to 35.5 degree C at its outlet. Assume an overall heat transfer coefficient of 0.0412 kJ . s-1. m-2 .K- 1(Edinger, Brady, and Graves, 1968). Note: the cooling water will be mixed with river water after it is cooled. The mixture of the 35 degree C water and the river water will meet thermal discharge standards.

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