A thin-walled pipe of 10 cm diameter is used to transport water to equipment that operates outdoors and uses the water as a coolant. In winter, the pipe wall achieves a temperature of -15°C and a cylindrical layer of ice (kice = 1.94 W/m-K) forms on the inner surface of the wall. If the mean water temperature is 3°C and a heat transfer coefficient of 2000 W/m2-K is maintained at the inner surface of the ice, which is at 0°C, what is the thickness of the ice layer?