To determine which car has the greatest efficiency, we need to look at the distance traveled per liter of fuel, which is a measure of fuel efficiency (often expressed in kilometers per liter).
Here are the cars listed with their fuel efficiencies:
- 1,200 kg car that travels 20 km per liter of fuel
- 1,200 kg car that travels 15 km per liter of fuel
- 900 kg car that travels 15 km per liter of fuel
- 900 kg car that travels 20 km per liter of fuel
From this list, we can see the fuel efficiencies:
- The first car has an efficiency of 20 km/l.
- The second car has an efficiency of 15 km/l.
- The third car has an efficiency of 15 km/l.
- The fourth car has an efficiency of 20 km/l.
Both the first and fourth cars have the highest efficiency of 20 km per liter. Therefore, the car with the greatest efficiency is:
- a 900 kg car that travels 20 km per liter of fuel.