A tractor carrying 500 kg of fertilizer travels from Farm X to Farm Y, a distance of 90 km. The tractor uses 18 litres of petrol per 100 km. Petrol is priced at ₹70 per litre. If the tractor's average speed is 15 km/h, calculate (i) the total petrol cost for the journey, and (ii) the total travel time.
Answer
(i) ₹1134 (ii) 6 hours
The correct answer is (i) ₹1134 (ii) 6 hours — (ii) Time = distance ÷ speed = 90 km ÷ 15 km/h = 6 hours.
Step-by-step solution
- (i) Fuel needed = (18 litres ÷ 100 km) × 90 km = 16.2 litres.
- Multiply by petrol price: 16.2 litres × ₹70/litre = ₹1134.
- (ii) Time = distance ÷ speed = 90 km ÷ 15 km/h = 6 hours.
Common mistake: Using 18 litres for 90 km directly instead of scaling
Concept tested: Fuel consumption and travel time
Published · How this solution was prepared and checked
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