SOLUTION: If I am riding a bike at 18 mph and my friend is riding 3 miles ahead at 12 mph. How long before I catch up to him?

Question 994497: If I am riding a bike at 18 mph and my friend is riding 3 miles ahead at 12 mph. How long before I catch up to him?
Answer by josmiceli(19441) (Show Source): You can put this solution on YOUR website!
Let = distance in miles you travel
until you catch friend
Let = time in hours it takes you
to catch friend
-----------------------
Friend's equation:
(1)
Your equation:
(2)
-----------------
Substitute (2) into (1)
(1)
(1)
(1)
---------------
You will catch friend in 1/2 hr
---------------
check:
(2)
(2)
and
(1)
(1)
(1)
OK
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