Please help

A 2-shell passes and 4-tube passes heat exchanger is used to cool 5kg/s of fluid ( cp=2.385 kJ/kgK) from 140C to 80C using water (Cp=4.18kJ/kgK) at 35C. The outlet temperature of the water is 75C. The heat transfer coefficients on the shell side and tube side are 1200W/m2C and 1500 W/m2C respectively. The fouling factor on the shell and tube side are estimated to be 0.0002 m2.C/W and 00003m2.C/W respectively. The thermal conductivity of the wall material is 45W/mC. The outside diameter is 19mm and the ratio of the outside diameter and inside diameter is 1.218(i.edid0=1.218). 6.1 Calculate the heat duty and mass flowrate of water required. (3) 6.2 Determine the overall heat transfer coefficient. (5) 6.3 Calculate the area of the heat exchanger. (6)