Rates are used to measure a quantity over another.
<em>The 1.8 million cars use </em><em> liters each year</em>
Given
--- distance
First, we calculate the number (n) of gallons used by each car
Solve for n
So, we have:
Convert miles to kilometers
The number of gallons (N), used by all the cars is:
Convert to liters
In scientific notation to 2 decimal places, we have:
<em>Hence, the number of liters used is </em><em />
Read more about distance and rates at: