A hot fluid at 2000C enters a heat exchanger at a mass flow rate of 104 kg/hr. Its specific het is 2000 J/kg-K. It is to be cooled by another fluid entering at 250C with a mass flow rate 2500 kg/hr and specific heat 400 J/kg-K. the overall heat transfer coefficient based on outside area of 20 m2 is 250 W/m2 K. Find the exit temperature of the hot fluid when the fluids are in parallel flow.