We want to design a HEX that cools 1.5 kg/s incoming water to 60C using 2 kg/s of air at 27 C. The overall heat transfer coefficient is thought to be 185 W/m2C and the available material area is 0.12 m2. find the temperatures at the outlet if using: a) parallel flow, b) counterflow, c) cross flow with both fluids unmixed, d) cross flow with a mixed fluid.