Water at the rate of 1 kg/s is forced through a tube with a 2.5-cm ID. The

Question:

Water at the rate of 1 kg/s is forced through a tube with a 2.5-cm ID. The inlet water temperature is 15oC, and the outlet water temperature is 50oC. The tube wall temperature is 14oC higher than the water temperature all along the length of the tube. What is the length of the tube?