A copper tube having square cross-section, has internal dimensions of 3.0 X 3.0 cm. It is used to transport water through a portion of a boiler. Water flows through the inside of the tube at a rate of 0.40 liters/min. The entire inside surface of the tube is kept at a constant 60 C. The water enters the tube at a temperature of 20 C. The tube is 2.0 m long. What will be the bulk (average) temperature of the water be when it exits? Show each step of your work.