To determine which car has the greatest efficiency, we look at the distance traveled per unit of fuel consumed. The kg weight of the car is less relevant for direct fuel efficiency comparison in this context, as we are looking at "km per liter."
Here are the fuel efficiencies for each option:
- 900 kg car that travels 15 km per liter: 15 km/L
- 1,200 kg car that travels 15 km per liter: 15 km/L
- 900 kg car that travels 20 km per liter: 20 km/L
- 1,200 kg car that travels 20 km per liter: 20 km/L
The highest efficiencies are found in the last two options, both 20 km per liter.
Thus, both the 900 kg car that travels 20 km per liter and the 1,200 kg car that travels 20 km per liter have the same greatest efficiency. However, if you need to select just one car, you could choose the 900 kg car that travels 20 km per liter for being lighter.
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