An uninsulated thin-wall pipe of 75 mm diameter is used to transport water at a temperature of 3?C to an outdoor cooling tower. During the winter, the pipe wall achieves a steady-state temperature of-15?C and a cylindrical layer of ice forms on the inner surface of the pipe. If a convection heat transfer coe?cient of 2500 W/(m2K) is maintained at the ice/water interface, and the ice is at 0?C, what is the thickness of the ice layer?