A counter flow double$-$pipe heat exchanger is to be used to heat $0\mathrm{.}6k\frac{g}{s}$ of water from $35$ to $90C$ with an oil flow of $0\mathrm{.}9k\frac{g}{s}.$ The oil has a specific heat of $2\mathrm{.}1k\frac{J}{k}gc$ and enters the heat exchanger at a temperature of $175C.$ The overall heal$-$Iransfer co$-$efficient is $425\frac{W}{m^2}c.$ Calculate the area of the heat exchanger and the effectiveness.