Car A covers 200 km with 10 litres of petrol. After re-filling, it covers 110 km with 5 litres of petrol. What is the difference in the fuel efficiency of the car before and after re-filling?

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Solution

The correct option is B
2
Given,
Distance covered in 10 litres of petrol = 200 km
Distance covered in 1 litre of petrol = $\frac{200}{10} = 20 k m$
Fuel efficiency before refilling = 20

After refilling,
Distance covered in 5 litres of petrol = 110 km
Distance covered in 1 litre of petrol = $\frac{110}{5} = 22 k m$
Fuel efficiency after refilling = 22

$∴$ Difference in fuel efficiencies = 22 - 20 = 2

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