Answer: 16.
Explanation: The answer is 16 because 960 divided by 15 is 64. Lets say 64 is the rectangular prism is a square now without height. Since it is a square that means it is equal on all sides. So 64 is all of the sides combined if you divide 64 by 4 (Squares have 4 sides) it is 16. Meaning each individual side is 16. I hope this helped, if you can please make me the brainliest.
