SOLUTION: In the last race, Lydia is 50 feet in front of Elma after 10 seconds. How fast can Lydia run if Elma can run 20 feet per second?

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Question 422318: In the last race, Lydia is 50 feet in front of Elma after 10 seconds. How fast can Lydia run if Elma can run 20 feet per second?
Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
The difference in their speeds is
50 ft/ 10 sec
Let s = Lydia's speed
+s+-+20+=+50%2F10+
s+=+5+%2B+20+
s+=+25+ ft/sec