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A car uses 4 litres of petrol for 60 km. Its mileage in km per litre is:
A12
B18
C15
D20
Answer & Solution
Correct answer: C. 15
1. Mileage is distance divided by fuel used.
2. Here that is 60 km for 4 litres.
3. So the mileage is 60 / 4.
4. That is 15 km per litre.
5. This constant ratio is what makes distance and petrol directly proportional: 12 litres would carry the car 180 km.
_Source: NCERT Class 8 Maths, Ch 11 'Direct and Inverse Proportions', S11.2 Direct Proportion_
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