TSD Q14

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?
a. Increase the speed
b. Decrease the speed
c. Maintain the speed at 60 km/hr
d. Cannot be determined

If she drives at 40 kmph, the fuel consumed = 200/40 * 2.5 = 12.5 liters

If she drives at 60 kmph, the fuel consumed = 13.33 liters

If she drives at 80 kmph, the fuel consumed = 200/80 * 7.9 = 19.75 l

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