<PRE><B>Question 874918</B>
A student walks and jogs to
college each day. She averages 5 km/h walking and 9km/h
jogging. The distance from home to college is
8 km, and she makes the trip in 1 hr. How far does the student jog?
***
let x=jogging distance
8-x=walking distance
Travel time=distance/speed
..
{{{x/9+(8-x)/5=1}}}
LCD:45
5x+9(8-x)=45
5x+72-9x=45
4x=27
x=27/4
How far does the student jog? 27/4 km </PRE>