Company produces two different containers. Container 1 is in the shape of a pyramid with a square base. It has a height of 6 feet and a volume of 12.5 cubic feet. Container 2 is in the shape of a cone. It has a diameter of 3.5 feet and the same height as Container 1. What is the length, in feet, of each side of the base of Container 1? Express your answer as a decimal to the nearest tenth of a foot.
How much greater is the volume of Container 2 than the volume of Container 1? Express your answer as a decimal rounded to the nearest tenth of a cubic foot.