Question 1129805
Andrea and Brad live 18km apart.
 Brad walked towards Andrea's house at 1.5km/h. 
Four hours later, Andrea leaves home and walks towards Brad's house at 4.5km/h.
 Find when and where they meet.
:
let t = B's walking time
A left four hrs later, therefore
(t-4) = A's walking time
;
When they meet, the total of their distances will be 18 km
write a distance equation; dist = speed * time
1.5t + 4.5(t-4) = 18
1.5t + 4.5t - 18 = 18
6t = 18 + 18
6t = 36
t = 36/6 
t = 6 hrs is Brad's walking time when they meet
Andrea will have walked 4 hrs less or 2 hrs
:
Find the point from Brad's house where they meet
1.5(6) = 9 mi or half way
;
:
Check this, B walked 9 mi and A walked 4.5(2), 9 mi, a total of 18 mi