SOLUTION: you started on a bike trip, riding at a rate of 9 miles per hour. your friend left one hour later and rode at the rate of 12 miles per hour. how long did it take your friend to cat

Question 495848: you started on a bike trip, riding at a rate of 9 miles per hour. your friend left one hour later and rode at the rate of 12 miles per hour. how long did it take your friend to catch up with you.
Answer by Alan3354(69443) (Show Source): You can put this solution on YOUR website!
you started on a bike trip, riding at a rate of 9 miles per hour. your friend left one hour later and rode at the rate of 12 miles per hour. how long did it take your friend to catch up with you.
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You're 9 miles ahead when the 2nd bike starts.
His speed wrt you is 3 mph (12-9).
9/3 = 3 hours
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