The colume of a rectangular box (rectangular prism) is given by the next formula:
[tex]V=l\cdot w\cdot h[/tex]As you need to fidn the width, solve w in that formula:
[tex]w=\frac{V}{l\cdot h}[/tex]Use the given measures and calculate the width:
[tex]\begin{gathered} w=\frac{4080cm^3}{15\operatorname{cm}\cdot17\operatorname{cm}} \\ \\ =\frac{4080cm^3}{255cm^2} \\ \\ =16\operatorname{cm} \end{gathered}[/tex]Then, the width of the rectangular box is 16 centimeters