Given data:
The volume of the swimming pool is V=7,200 ft^3.
The width of the pool is b=20 feet.
The depth of the pool is d=9 feet.
The expression for the volume of the pool is,
[tex]V=l\times b\times d[/tex]Substitute the given values in the above expression.
[tex]\begin{gathered} 7,200ft^3=l(20\text{ ft)(9 ft)} \\ l=40\text{ ft} \end{gathered}[/tex]Thus, the length of the pool is 40 ft.
