Question 100091
Let t=time spent walking until they meet
distance(d)=rate(r) times time(t) or d=rt;r=d/t and t=d/r

distance John walked=rt=3*t
distance Fred walked =rt=2*t

Now we know that when they meet, the distance John had walked plus the distance Fred had walked must equal 4 mi.  So our equation to solve is:

3t+2t=4
5t=4  divide both sides by 5

t=4/5 hr or 48 min-------------time elapsed until they meet


CK

3*(4/5)+2*(4/5)=4 mi
12/5+8/5=4
20/5=4
4=4


Hope this helps---ptaylor