Deb often pumps water from her dam into storage containers used in her sheds. One of her containers is a pyramid shape with a square base and four lateral faces being equilateral triangles. The base has been removed and it is turned over so that its vertex is pointing down. Water is pumped into this container at a rate of 0.02 m3 /min. What is the rate of change of the height of water in the container when the water level is 1.2 ?