A rate is a ratio that compare numbers or quantities expressed in different units.
For example, suppose 5 people pay 35 dollars to enter an amusement park.
The number of people is one kind of unit and the cost is another kind of unit.
5/35 and 35/5 are rates
5/35 = 1/7 and 35/5 = 7/1
1/7 means 1 person per 7 dollars
7/1 means 7 dollars per person
1. A car travel 160 km every 5 hours. The distance expressed in km is one kind of unit and the time expressed in hours is another kind of unit.
2. A woman walks 18000 steps every 6 days. The number of steps is one kind of unit and the time expressed in days is another kind of unit.
3. A meal at a restaurant has 1200 calories for every 3 servings. The number of calories is one kind of unit and the number of servings is another kind of unit.
When you do ratios for the aforementioned examples, you get rates.