Answer:
The square pyramid holds more space (18 more cubic meters than the rectangular pyramid)
Explanation:
The first pyramid has a volume of 3 * 10 * 12 / 3 = 120
The second pyramid has a volume of 6 * 6 * 11.5 / 3 = 138.
The volume of the rectangular pyramid is 120 cubic meters. The volume of the square pyramid is 138 cubic meters. The volume of the rectangular prism is less than the volume of the square pyramid.