Final Answer: 41.7
The other person who answered is incorrect. I completed an assignment just now with the exact question listed above, and my answer (41.7) was correct.
You have to use this equation:
V = 1/3 (5 • 5) (5)
V = 1/3 • 25 • 5
V = 125/3
V = 41.6667
V = 41.7 (rounded to nearest hundreth)