To determine which car achieved the greatest fuel efficiency, we need to calculate the fuel efficiency (in kilometers per liter) for each car. The formula for fuel efficiency is:
\[ \text{Fuel Efficiency} = \frac{\text{Distance Traveled (km)}}{\text{Liters of Gas Used}} \]
Let's calculate the efficiency for each car:
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Car 1: Traveled 80 km on 5.0 liters \[ \text{Efficiency} = \frac{80 \text{ km}}{5.0 \text{ L}} = 16 \text{ km/L} \]
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Car 2: Traveled 70 km on 5.0 liters \[ \text{Efficiency} = \frac{70 \text{ km}}{5.0 \text{ L}} = 14 \text{ km/L} \]
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Car 3: Traveled 50 km on 4.0 liters \[ \text{Efficiency} = \frac{50 \text{ km}}{4.0 \text{ L}} = 12.5 \text{ km/L} \]
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Car 4: Traveled 90 km on 6.0 liters \[ \text{Efficiency} = \frac{90 \text{ km}}{6.0 \text{ L}} = 15 \text{ km/L} \]
Now we can summarize the efficiencies:
- Car 1: 16 km/L
- Car 2: 14 km/L
- Car 3: 12.5 km/L
- Car 4: 15 km/L
The car that achieved the greatest efficiency is Car 1, which traveled 80 kilometers on 5.0 liters of gas, resulting in 16 km/L.