a car travels a distance of 400 km and consumes x km per litre of fuel. then the driver gets the engine serviced. the same car then travels a distance of 400 km but the fuel consumption is (x+5) km per litre. how many litres of petrol was consumed by the car in the total journey?

First the car consumed xkm/ litre, then x+5km/litre
Total distance=400km+400km
Total petrol consumption=400
= 400/x + 400/(x+5) litres
= (400(x+5) + {(400x/[(x(x+5]} litres
= (800x+2000)/(x(x+5)) litres
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 i got this question

"do you think the driver could have saved more petrol? if so how?

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