In a triple-effect feedforward evaporator, a 10% salt solution by mass is desired to be concentrated to 30%. boiling point elevation of the solution, where " x " is the mass fraction of the salt in the solution; It is expressed as KNY =1.90x+52. Saturated steam at 415kPa is used in the system. The vapor pressure of the third effect is 58kPa. The feed flow rate is 12000kg/h and the feed temperature is 330K. If the heat transfer coefficients are U1 =3000,U2=2000 and U3 =1500W/m2.K, determine the total temperature difference (2AT) in this system. (Note: You don't need to do any trial and error.) a) 60 b) 58.15 c) 55.45 d) 56.51 e) 61.15