Question 908494
 Dan left downtown greensboro, and three hours later, Sara left going 51 mph faster to catch up. after another two hours, Sara caught up.
 Find dan's average speed
:
let s = Dan's speed
then
(s+51) = Sara's speed
:
From the information given, we know that S's travel time is 2 hrs, D's is 5 hrs
:
When S catches D, they will have traveled the same distance
Write a distance equation; dist = time * speed
5s = 2(s+51)
5s = 2s + 102
5s - 2s = 102
3s = 102
s = 102/3
s = 34 mph is D's speed
:
:
Confirm this, find the distance each traveled, should be equal
5 * 34 = 170 mi
2 * 85 = 170 mi