heat transfer question help me!

5. (20pt) A reflux condenser contains a copper tube (ID = 0.620 in., thickness = 0.065 in., kou = 380 W/m-K) in which cooling water circulates. Hydrocarbon vapors condense on the exterior surfaces of the tube. Find the overall heat transfer coefficient U. What is the fractional resistance due to fouling? Inside convective heat transfer coefficient - 4500 W/mK Outside convective coefficient = 1500 W/mK The fouling factor coefficients: 2840 W/m:K (water) and 5700 W/m-K (hydrocarbon vapor)