Question

Manasa would like to minimize the fuel consumption for the trip by driving at the appropriate speed. How should she change the speed ? (2001)

• 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.