A vehicle covers $20\text{ km}$ per kilogram of Compressed Natural Gas (CNG) costing $\text{₹}70/\text{kg}$.…

A vehicle covers $20\text{ km}$ per kilogram of Compressed Natural Gas (CNG) costing $\text{₹}70/\text{kg}$. The same vehicle covers $15\text{ km}$ per litre of Petrol costing $\text{₹}100/\text{litre}$. How much money is saved on fuel by choosing CNG over Petrol for a $60\text{ km}$ trip?
  1. $\text{₹}190$
  2. $\text{₹}210$
  3. $\text{₹}120$
  4. $\text{₹}270$

Solution

CNG required for $60\text{ km} = 3\text{ kg}$ costing $3 \times 70 = \text{₹}210$. Petrol required for $60\text{ km} = 4\text{ litres}$ costing $4 \times 100 = \text{₹}400$. Fuel cost savings = $400 - 210 = \text{₹}190$.

Asked in: Homi Bhabha Practice

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