To find the length of a rectangular prism, you can use the formula for the volume of a rectangular prism, which is given by:
\[ \text{Volume} = \text{Length} \times \text{Width} \times \text{Height} \]
In this case, the volume is 90, the width is 3, and the height is 5. We can rearrange the formula to solve for the length:
\[ \text{Length} = \frac{\text{Volume}}{\text{Width} \times \text{Height}} \]
Substituting the values into the formula:
\[ \text{Length} = \frac{90}{3 \times 5} \]
Calculating the denominator:
\[ 3 \times 5 = 15 \]
Now, substituting back into the equation:
\[ \text{Length} = \frac{90}{15} = 6 \]
Thus, the length of the rectangular prism is \( \boxed{6} \).
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