Convert the following description to a proper scale ratio:

$3$3 cm represents an actual distance of $9$9 m.

$20$20 cm represents an actual distance of $16$16 km.

$8$8 mm represents an actual distance of $40$40 m.

Convert the following description to a scale ratio in simplified form:

$60$60 mm represents an actual distance of $5400$5400 m.

Solve problems requiring the manipulation of expressions arising from applications of percent, ratio, rate, and proportion