The area of a rectangle is the product of the length and width.

Substitute the area and the unknown length or the width into the equation $A = l · w$.

Solve for the unknown variable.

$60 =\text{length} \cdot 8$

$\frac{ 60 }{ 8} = \frac{ \text{length } \cdot 8 }{8 }$

$\text{ length} = \frac{ 60 }{8 } = 7.5$

Try not to be confused by the orientation of the rectangle. Solve as in part (a).