Question

what does the word odometer mean?
a tool that increases the distance a car can travel on a tank of gas
a tool that measures the distance that a car has traveled
a tool that reduces the sound made by a car engine

Explanation:

The word "odometer" is related to measurement. By recalling the common knowledge of vehicle instruments, an odometer is specifically for measuring the distance a vehicle has traveled. The first option about increasing distance on a gas tank is about fuel efficiency (not odometer's function), and the third option about reducing engine sound is related to mufflers (not odometer).

Answer:

a tool that measures the distance that a car has traveled