On average, Sam’s truck will travel 57 miles per 2.5 gallons of gas. How many kilometers per liter of gas will the truck travel?
Answer: First we have to find number of miles Sam's truck travel per gallon of gas.
Miles per gallon is:

We know that:
1 Mile = 1.609 km
1 liter = 0.264 gallon
Therefore, the number of kilometers per liter of gas the truck will travel is:
km/liter