Verified Answer :

Please see the pic, I'd solved in it.

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The formula of the Volume of a Prism is:
V = Area of base × height of prism
   = Length × Width  × Height of prism
Change the mixed numbers to improper fractions

\(11\frac{3}{5}\) = \(\frac{58}{5}\)
\(12 \frac{1}{2}\) = \(\frac{25}{2}\)

V = \(\frac{58}{5}\) × 9 ×\(\frac{25}{2}\)
   =\(\frac{13050}{10}\)
   =1305 m³