Question 317855
let her walk x km.
she will jog 8-x km
..
walking speed = 5km/hr
jogging speed = 9km/hr
..
distance to college 8km.

walking time + jogging time = total time
x/5+ 8-x /9 =1
9x+40-5x /45=1
4x+40=45
4x=5
x= 5/4 km
she walks 5/4 km
1.25 km
so she jogs 8-5/4
32-5 /4
27/4
6.75 km