Question 1080072
let s = J's speed
then
(s+10) = C's speed
:
Julio left the hospital and drove toward his friend's house.
 One hour later Chelsea left driving 10 km/h faster in an effort to catch up to him.
 After four hours Chelsea finally caught up.
 Find Julio's average speed.
:
We know that from the information given, that that:
J's travel time = 5 hrs (1 hr more than C's) 
C's travel time = 4 hrs
:
We know that when C catches J, they will have traveled the same distance.
Write a distance equation: dist = time * speed
J's dist = C's dist
5s = 4(s+10)
5s = 4s + 40
5s - 4s = 40
s = 40 mph is J's speed
:
:
:
Confirm this solution, find the actual dist of each
5(40) = 200 mi
4(40+10) = 200 mi