SOLUTION: During 100km of city driving Sue averaged 8km/L. She then drove 300km on an interstate highway and averaged 12km/L for the entire 400km. Find her average fuel consumption on the hi

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Question 24909: During 100km of city driving Sue averaged 8km/L. She then drove 300km on an interstate highway and averaged 12km/L for the entire 400km. Find her average fuel consumption on the highway.
Answer by stanbon(75887) About Me  (Show Source):
You can put this solution on YOUR website!
100km at 8km/L requires 12.5 liters
300km at 12km/L requires 25 liters
Therefore 37.5 liters were used to go 400km.
Divide 400km by 37.5 liters to get 10 2/3 km/L
Cheers,
Stan H.