Question

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

Answer 1

The correct option is B Decrease the speed

(b) At a speed of 40 km/hr,60 km/hr, and 80 km/hr distance travelled in 1 litre of petrol.

$=\frac{40}{2.5}=16km,\frac{60}{4}=15km,\frac{80}{7.9}=10.1km.$ respectively.
Hence at lower speed fuel consumption is less.Hence in order to minimize the fuel consumption, the speed should be decreased.