On 18th May, when my Maruti was showing a km reading of 4440, it stopped in the middle of the road because the petrol got over. I got down from the car and poured the 5 litres of petrol I had in a can with me. Then, on 25th May, when the km reading was 4474, I went to the petrol pump and got the petrol tank filled to the brim by putting 28 litres of petrol. On 7th June, my father-in-law filled up another 10 litres but he said that he did not remember the km reading of the car. On 11th June and 19th June, I got the tank filled completely when the km reading was 5139 and 5689 respectively-each time filling 25 litres. On 25th June, i.e. today, I again got the tank filled to the brim by putting 22 litres when the km reading was 6112.5. Petrol was always filled up first thing in the morning at the petrol pump next to my house.
Fuel efficiency of a car is defined as the number of kms the car gives per litre of petrol.

Q) What is the fuel efficiency of my car from 25th May to 25th June?

a) 19.97 km/Lt b) 18.67 km/Lt c) 14.97 km/Lt d)15.27 km/Lt