An automobile radiator may be viewed as a cross-flow heat exchanger with both fluids unmixed. Water with a flow rate of 0.06 kg/s, enters the radiator at 410 K and is to leave at 340 K. The water is cooled by air that enters at 0.75 kg/s and 300 K. If the overall heat transfer coefficient is 220 W/m2·K, what is the required heat transfer surface area?