Orange juice (with a mean heat capacity of 3.8 kJ/kg*K) enters a heat exchanger at 12°C with a flow rate of 500 kg/h. It is heated by water flowing at 0.11 kg/s and the water temperature falls from 80 to 30°C. What is the final temperature of the orange juice?
a) 56°C
b) 62°C
c) 66°C
d) 72°C