A concentric tube heat exchanger is used to heat-up 35 kg/min of Glycerin from 7∘ C to 47∘C. Water is used as the heating fluid. It is known that water exits the exchanger at 43∘ C at a rate of 15 kg/min. For the heat exchanger, it is known that: - The inside diameter of the inner pipe is 3.0 cm, and the pipe thickness is 0.2 cm. - The inside diameter of the outer pipe is 4.8 cm - The overall heat transfer coefficient, based on the inside area available for heat transfer, is 730 W/(m²K) Determine the length of the heat exchanger.