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
To minimize fuel consumption, Manasa has to decrease the speed.Write Here