The volume of a pyramid can be calculated using the formula V = (1/3)bh, where b is the area of the base and h is the height of the pyramid.
In this case, the base is a rectangle with a length of 24 feet and a width of 15 feet, so the area of the base is 24 * 15 = 360 square feet.
The height of the pyramid is given as 20 feet.
Using the formula V = (1/3)bh, we can calculate the volume:
V = (1/3) * 360 * 20 = 2400 cubic feet.
Therefore, the volume of the pyramid is 2400 cubic feet.