solve it quickly please

Water at a flow rate of 5000kg/hr will be heated from 20C to 35C by hot water at 110C. A 15C hot water temperature drop is allowed. A number of 3.5m hairpins of 3in. (ID =0.0779m ) by 2in. (ID =0.0525m,OD= 0.0603m ) counterflow double-pipe heat exchangers with annuli and pipes, each connected in series, will be used. Hot water flows through the inner tube. Fouling factors are: R1=0.000176m2K/W,Rf0=0.000352m2K/W. Assume that the pipe is made of carbon steel (k=54W/mK). The heat exchanger is insulated against heat losses. 1. Calculate the number of hairpins. 2. Calculate the pressure drops. From the appendix, the properties of hot water at Tb=132.5C are: kPr=932.53kg/m3,cp=4.268kJ/kgK=0.687W/mK,=0.207103Pas=1.28 At 27.5C the properties of water are: kPr=996.4kg/m3,cr=4.179kJ/kgK=0.609W/mK,=0.841103Pas=5.77