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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 makes the $200$ km trip from Mumbai to Pune at a steady speed of $60$ km/hour. What is the amount of petrol consumed for the journey?

  1. $12.5$ litres
  2. $13.33$ litres
  3. $16$ litres
  4. $19.75$ litres
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1.     Total time of trip from Mumbai to Pune =$\frac{Distance}{speed}$=$\frac{200}{60}$ Hour

           At speed of 60 km/hr petrol consumption rate=4 Litre / hour

          Total amount of petrol consumed for the journey=$\frac{200}{60}$ * 4 =13.33

         

Hence,Option (2) 13.33 Litres .

 

2.  (1) When we increase the speed from 60 km/hr to 80 km/hr then petrol consumption will increase by 6.42 Litres.

          $\frac{200}{80}$ * 7.9 - $\frac{200}{60}$ * 4 = 6.42

     (2) When we decreased the speed from 60 km/hr to 40 km/hr then petrol consumption will decrease by 0.83 Litres.

               $\frac{200}{60}$ * 4  -  $\frac{200}{40}$ * 7.9 = 0.83

     (3) we can't reduce the petrol consumption by Maintaining the speed at 60 km/hour.

 

Hence,Option (2) Decrease the speed .

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