A new pond has the form of an inverted, capped square pyramid as shown on the right.

5. (16 points) A new pond has the form of an inverted, capped square pyramid as shown on the right. The smaller square at the bottom has side length 2m, the top square has side length 8m. Water is lled in at a rate of % cubic meters per hour. At what rate is the water level rising exactly 1 hour after the water started to ll the pond? Hint: The volume of a full square pyramid is 1 V = gazh, where a is the side length of the pyramid's base and h is the height of the pyramid