To find the length of a rectangular prism, you can use the formula for the volume of a rectangular prism:
\[ \text{Volume} = \text{Length} \times \text{Width} \times \text{Height} \]
Given the volume (90), width (3), and height (5), we can rearrange the formula to solve for length:
\[ \text{Length} = \frac{\text{Volume}}{\text{Width} \times \text{Height}} \]
Substituting the known values:
\[ \text{Length} = \frac{90}{3 \times 5} \]
Calculating the width times height:
\[ 3 \times 5 = 15 \]
Now substitute back into the equation:
\[ \text{Length} = \frac{90}{15} = 6 \]
Thus, the length of the rectangular prism is \(6\).
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