posted by kathy .
A student walks and jogs to college each day.She averages 5km/h walking and 9km/h jogging.Tha distance is 8km and she makes the trip in 1 hour. How far does she jog?
let her distance walking be x km
then her distance jogging is 9-x km
The total of her times walking and jogging is 1 hour
x/5 + (8-x)/9 = 1
multiply by 45
9x + 5(8-x) = 45
I will let you finish it.