Answer the following questions based on the information given below.
The petrol consumption rate of a new model car 'Palto' depends on its speed and may be described by the graph below.
Manasa would like to minimize the fuel consumption for the trip by driving at the appropriate speed. How should she change the speed?
- Increase the speed
- Decrease the speed
- Maintain the speed at $60$ km/hour
- Cannot be determined