Rate
Definition: A comparison of two related quantities.
Often the second quantity is time (per second, per hour, etc) but it can be anything.
Can be in the style "this per that" or as a single number calculated using division.
For example
Amy makes 3 sandwiches every 6 minutes that is a rate of
1 sandwich per minute
2 sandwiches every two minutes
that can be express in a fraction like
3/6 if we simplify we obtain 1/2