How to do this question plzzz

Hi king,
Let's split it into two prisms.
[tex]V_{1}=5cm*10cm*3cm\\V_{1} =150cm^{3}[/tex]
[tex]V_{2}=5cm*10cm*(9cm-5cm)\\V_{2}=5cm*10cm*4cm\\V_{2} =200cm^{3}[/tex]
The prism in the picture:
[tex]V_{final}=150cm^{3} +200cm^{3} \\V_{final}=350cm^{3}[/tex]
Have a good day.