MY WORK: For this question, I used efficiency and the electrical capacity to figure out the total P_in. After that I found out heat energy by subtracting total P_out from the capacity. Afterward, I used Q = m*L to figure out the mass of water melted and then divided that number by the density of water. I got 23.202 km^3 of added melted water. However, I'm stuck here and don't know how to figure out the increase in depth with the value of increased volume? Any insight/guidance would be greatly appreciated. Thanks.