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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 total journey?Do you think , the driver could have saved more petrol ? If so how ?


Total consumption of fuel = 400 / x + 400 / (x+5) 
= 400 ( x+5) + 400x 
x ( x+5) 
= 400 ( 2x +5) 
x ( x+5) Litres of petrol

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