Question 59
A car uses 18 litres of petrol in travelling 270 kilometers. In order for the car to travel the same distance using 10 litres of petrol, by how many kilometers per litre must the car’s fuel mileage be increased?
Solution
Mileage when car uses 18 litres to travel 270 km = $$\frac{270}{18}$$ = 15 km/litre
Mileage required to travel 270 km using 10 litres = $$\frac{270}{10}$$ = 27 km/litre
Mileage should be increased by 27-15 = 12 km/litre
Answer is option A.
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