The answer depends on how the rate is measured.
Consider the fuel efficiency rate for cars. Under the outdated Imperial system, it is measured as miles per gallon and the volume of fuel is the denominator. The SI definition is based on litres per 100 kilometres. So the distance travelled is the denominator.
Syntax refers to the rules for constructing a function.
unit rate
Constructing refers to building things. You can construct houses, bridges, buildings, businesses and relationships, however it usually refers to a physical build.
A unit rate always has a 1 as a denominator.
You rename the rate such that either the numerator, or the denominator is 1. It is usually the denominator, but can be the numerator.
A unit rate is a ratio in which the numerator or denominator is 1 unit.
It is a unit rate.
It is a unit rate.
It is the unit rate.
It is a unit rate.
The unit rate.
It is a unit rate.