Answer :

Answer:

The length is 6.

Step-by-step explanation:

The volume of a right rectangular prism is given by

V = l*w*h where l is the length, w is the width and h is the height.

90 = l * 3 * 5

90 = 15 l

Divide each side by 15.

90/15 = 15l/15

6 = l

The length is 6.