Answer:
5^13
The question wasn't very clear so this might be wrong.
Explanation:
So the width of the rectangular prism is 5^3 * 5 = 5^4
The height of the prism is 5^2 * 5^4 = 5^6
The volume is 5^4 * 5^6 * 5^3 = 5^13
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