a car travels a distance of 400km 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 comsumed the car in the total journey ?
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for first 400 km mileage is x km/l
fuel required for first 400km = 400/x
for second 400km mileage is (x+5) km/l
fuel required for 2nd 400km = 400/(x+5)
total fuel consumed for 800km journey = (400/x) + (400/(x+5))
= ( (800x+2000) / x(x+5) )
fuel required for first 400km = 400/x
for second 400km mileage is (x+5) km/l
fuel required for 2nd 400km = 400/(x+5)
total fuel consumed for 800km journey = (400/x) + (400/(x+5))
= ( (800x+2000) / x(x+5) )
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