To find the volume of a right rectangular prism, you can use the formula:
\[ \text{Volume} = \text{length} \times \text{width} \times \text{height} \]
Given the length \( l = 12 \) and width \( w = 5 \), we still need the height \( h \) to calculate the volume.
If you provide the height, you can substitute all the values into the formula. For example, if the height were \( h \), the volume would be calculated as:
\[ \text{Volume} = 12 \times 5 \times h \]
Please provide the height, and I can help you find the volume!