Simplify and collect like terms: 
Definitions:
Time Duration
The length of time that occurs between two events or processes.
Vehicle Miles-Per-Gallon
A measure of how many miles a vehicle can travel on a single gallon of fuel, used as an indicator of fuel efficiency.
Population Size
The total number of individuals or items in the group being studied.
Sample Size
The number of observations or subjects used in a study or represented in a statistical sample.
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