To determine which car has the greatest efficiency, we can consider the fuel efficiency in terms of kilometers traveled per kilogram of vehicle mass.
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1,200 kg car that travels 20 km per liter of fuel: Efficiency = 20 km / 1,200 kg = 0.01667 km/kg
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900 kg car that travels 15 km per liter of fuel: Efficiency = 15 km / 900 kg = 0.01667 km/kg
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900 kg car that travels 20 km per liter of fuel: Efficiency = 20 km / 900 kg = 0.02222 km/kg
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1,200 kg car that travels 15 km per liter of fuel: Efficiency = 15 km / 1,200 kg = 0.0125 km/kg
Now, comparing the efficiencies:
- 1,200 kg car (20 km/L): 0.01667 km/kg
- 900 kg car (15 km/L): 0.01667 km/kg
- 900 kg car (20 km/L): 0.02222 km/kg
- 1,200 kg car (15 km/L): 0.0125 km/kg
The car with the greatest efficiency is the 900 kg car that travels 20 km per liter of fuel, with an efficiency of approximately 0.02222 km/kg.