Question

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

Answer 1

total distance=400 km
consumes x l/km
total petrol used=$\frac{400}{x}$
distance=400 km
after service= x+5 l/km
total petrol used=$\frac{400}{x+5}$

Grand total=[tex] \frac{400}{x} + \frac{400}{x+5} \\ \\ \frac{400x+2000+400x }{ x^{2} +5x} \\ \\ \frac{800x+2000}{ x^{2} +5x} [/tex]