SOLUTION: Peter drove from Ottawa to London, a distance of 575km in 8 hours. Part of the trip was spent driving on a four-lane highway where he averaged 100km/h. The remainder of the trip wa

Question 1101054: Peter drove from Ottawa to London, a distance of 575km in 8 hours. Part of the trip was spent driving on a four-lane highway where he averaged 100km/h. The remainder of the trip was spent on a two-lane highway where he averaged 50km/h. How much time was spent driving on the four-lane highway. (use algebra)
Answer by jorel1380(3719) (Show Source): You can put this solution on YOUR website!
Let n be the part he drove at 100 kmh, and 575-n be the part driven at 50 kph. Then:
n/100 + 575-n/50=8
n+2(575-n)=800
n=350
Peter drove 350 km at 100 kph
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