In a double pipe heat exchanger with a total external surface of 70 ft2 it is to be cooled aniline from 200 to 150 F. For the soul used toluene current 8600 lb/h with a temperature of 100 F. The exchanger consists of a 1.25 in Schedule 40 pipe which is inside a tube 2 in Schedule 40. The flow rate of aniline is 10000 lbs/hr. (a) If the flow is countercurrent, calculate its exit temperature of toluene, the logarithmic