Question

A car covers 120 km distance in 3 litre petrol, if 7 litre petrol is filled up in the car tank, then find the distance covered by the car.

Answer 1

120 km in 3 L than in 1 L petrol car travel=120÷3 =40km
in 7L petrol car cover distance =40 ×7= 280 km

Answer 2

Solution :

Let the distance covered = d km

Petrol consumed = c liters

________________

d | 120 | d2

________________

c | 3 li | 7 li

________________

We know that ,

d is directly proportional to c

Therefore ,

d1 × c2 = d2 × c1

=> 120 × 7 = d2 × 3

=> ( 120 × 7 )/3 = d2

=> 40 × 7 = d2

=> 280 = d2

Therefore ,

Distance covered by 7 liter

Petrol = d2 = 280 km

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