Oil flowing at a rate of $180k\frac{g}{m}in$ enters a parallel double pipe heat exchanger at $25C$ and is heated by a water

stream flowing at rate of $300k\frac{g}{m}in$ and entering to the heat exchanger at $80C.$ Calculate oil exit temperature.

Take $C_{P,\text{o}\text{i}\text{l}}=2k\frac{J}{k}gK,C_{P,\text{w}\text{a}\text{t}\text{e}\text{r}}=4\mathrm{.}2k\frac{J}{k}gK,U=400\frac{W}{m^2}K$ and $A=10m^2.$