SOLUTION: In a 30 mile race between Joe and Frank, Joe started an hour after frank and finished an hour before Frank. Joe's average speed was 1 mile per hour faster than Franks. Find Joe and

Question 675983: In a 30 mile race between Joe and Frank, Joe started an hour after frank and finished an hour before Frank. Joe's average speed was 1 mile per hour faster than Franks. Find Joe and Frank's average seed during the race.
Answer by josmiceli(19441) (Show Source): You can put this solution on YOUR website!
Let = Frank's speed in mi/hr
= Joe's speed in mi/hr
= Frank's head start in miles
= Frank's time after his head start
= Joe's time after Frank's head start
---------------
Frank's equation:
(1)
Joe's equation:
(2)
--------------------------
(2)
(2)
and
(1)
Substitute this into (2)
(2)
(2)
(2)
(2)
(2)
(2)
Use quadratic formula

mi/hr = Frank's speed
mi/hr = Joe's speed
My math could have got messed up- check it

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