To determine which car has the highest efficiency, we need to calculate the distance traveled per liter of gas for each option.
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A car that traveled 20 kilometers on 2 liters of gas: \[ \text{Efficiency} = \frac{20 \text{ km}}{2 \text{ liters}} = 10 \text{ km/l} \]
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A car that traveled 25 kilometers on 2 liters of gas: \[ \text{Efficiency} = \frac{25 \text{ km}}{2 \text{ liters}} = 12.5 \text{ km/l} \]
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A car that traveled 20 kilometers on 1 liter of gas: \[ \text{Efficiency} = \frac{20 \text{ km}}{1 \text{ liter}} = 20 \text{ km/l} \]
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A car that traveled 25 kilometers on 1 liter of gas: \[ \text{Efficiency} = \frac{25 \text{ km}}{1 \text{ liter}} = 25 \text{ km/l} \]
Comparing the efficiencies:
- Car 1: 10 km/l
- Car 2: 12.5 km/l
- Car 3: 20 km/l
- Car 4: 25 km/l
The car that traveled 25 kilometers on 1 liter of gas has the highest efficiency of 25 km/l.
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