:Lori drove from New York to Virginia , a distance of 575 km in 8 hours. Part of this trip was spent driving on a four -lane highway where she averaged 100km/h.The remainder of the trip was spent on a two lane highway where she averaged 50km/h.How much time spent driving on the four-lane highway?

Question

:Lori drove from New York to Virginia , a distance of 575 km in 8 hours. Part  of this trip was spent driving on a four -lane highway where she averaged 100km/h.The remainder of the trip was spent on a two lane highway where she averaged 50km/h.How much time spent driving on the four-lane highway?

anonymous · Answer

Please explain

anonymous · Answer

let x be the time she spent on the four lane
and 8-x be the time she spent on the two lane

100*x + 50*(8-x) = 575

50x = 175
x=3.5