Comprehension
The petrol consumption rate of a new model car ’Palto’ depends on its speed and may be described by the graph below
Question: 1
Manasa makes a 200 km trip from Mumbai to Pune at a steady speed of 60 km/hr. What is the volume of petrol consumed for the journey?
Manasa makes a 200 km trip from Mumbai to Pune at a steady speed of 60 km/hr. What is the volume of petrol consumed for the journey?
Show Hint
Fuel consumption volume = fuel consumption rate (per hr) $\times$ travel time.
Updated On: Aug 4, 2025
- 12.5 L
- 13.33 L
- 16 L
- 19.75 L
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Verified By Collegedunia
The Correct Option is B
Solution and Explanation
From the graph, at 60 km/hr the petrol consumption rate is 4 L/hr.
Speed = 60 km/hr $\Rightarrow$ time for 200 km = $\frac{200}{60} \approx 3.\overline{3}$ hours.
Fuel consumed = rate $\times$ time = $4 \times 3.\overline{3} = 13.\overline{3}$ L.
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Question: 2
Manasa would like to minimize the fuel consumption for the trip by driving at the appropriate speed. How should she change the speed?
Manasa would like to minimize the fuel consumption for the trip by driving at the appropriate speed. How should she change the speed?
Show Hint
When minimizing fuel use, pick the speed with the lowest rate from the fuel consumption graph.
Updated On: Aug 4, 2025
- Increase the speed
- Decrease the speed
- Maintain the speed at 60 km/hr
- Cannot be determined
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Verified By Collegedunia
The Correct Option is B
Solution and Explanation
From the graph, minimum fuel consumption rate is at 40 km/hr with about 2.5 L/hr, which is lower than the 4 L/hr at 60 km/hr. Therefore, reducing the speed toward 40 km/hr would reduce total fuel used for the same distance.
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