Question

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​

Answer 1

Answer:

Distance=400km

consumption=xkm per litre

fuel consumed=400/x

after servicing

distance=400km

consumption rate=(x+5)

fuel consumed=400/(x+5)

total litres of fuel=400/x +400/(x+5)