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Ramya, based in Shanpur, took her car for a 400 km trip to Rampur. She maintained a log of the odometer readings and the amount of petrol she purchased at different petrol pumps at different prices (given below). Her car already had 10 litres of petrol at the start of the journey, and she first purchased petrol at the start of the journey, as given in table below, and she had 5 litres remaining at the end of the journey.
What has been the mileage (in kilometers per litre) of her car over the entire trip?
At the start, Ramya has 10 litres petrol. She purchased 20 litres, 15 litres and 10 litres.
At the end, she has left 5 litres of petrol.
Petrol used = $$(10 + 20 + 15 + 10 - 5) = 50$$ litres
Distance travelled = $$800 - 400 = 400$$ km
$$\therefore$$ Mileage of Ramya's car = $$\frac{400}{50} = 8$$ km/litre
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