Question 875028
A student walks and jogs to
college each day. 


and 9 km/h jogging. 
let this distance be x
time = x/9

She averages  5km/h walking 
this distance will be 8-x
(8-x)/5


 she makes the trip in 1 hr. 
{{{x/9 + (8-x)/5 =1

multiply by 45

5x+72-9x=45
4x=27
x=27/4
x=6.75 km