Question

how much petrol will be required for a distance of 120 km when the distance coved in 1.5 ltr is 72km?

Answer 1

72   km = 1.5 L
1     km = $\frac{1.5}{72}$ L
120 km = $\frac{15}{720}$ × 120
             = $\frac{1800}{72}$
             = 25 L