Okay, so there is a large floating mass of ice in the sea. We know the time it takes to melt: it's 168 hours, or 604800 seconds. The temperature of the air is 25 degrees Celsius. The surface area of the ice is 2408 km^2. Temperature of the ice is -1 degrees Celsius. Thermal conductivity of air is 0.024, right? How do I calculate the mass of the ice?