How do i simplify 4 over 12 times 8 over 20

Find and simplify an expression for the area of five rows of x squares with side lengths of x centimeters.

The following division is being performed using multiplication by the reciprocal find the missing numbers is 5/12 divided by x/3 equals 5/12 times x/10 equals 1/x

Ihonestly have no clue if it's each or none.