Milk enters at 25°C through inner pipe of a concentric double pipe heat exchanger. Hot water enters at 82.5°C and flows countercurrently (flow rate =1.2 kg.s^-1) through the annular region. The diameter of inner pipe, length of the pipe and average overall heat transfer coefficient are 60 mm, 6 m, and 2100 W.m^-2.K^-1, respectively. The average values of specific heat capacity of water and milk are 4.18 kJ.kg^-1.K^-1 and 3.95 kJ.kg^-1.K^-1, respectively. The effectiveness of the heat exchanger is 0.572 and the NTU is 1.01. Assuming the steady-state condition and considering π as 3.14, the temperature of hot water at exit of the pipe is ______ °C. (Rounded off to 1 decimal place)