The volume V of a rectangular prism is given by the formula:
V = l x w x h
where l is the length, w is the width, and h is the height.
In this case, we have:
l = 12 inches
w = 25 inches
h = 20 inches
Substituting these values into the formula, we get:
V = 12 inches x 25 inches x 20 inches
Multiplying, we get:
V = 6,000 cubic inches
Therefore, the volume of the rectangular prism is 6,000 cubic inches.