SOLUTION: How long will it take someone running at 12 mph to catch up to someone walking at 5 mph with an hour and a half head start?

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Question 870516: How long will it take someone running at 12 mph to catch up to someone walking at
5 mph with an hour and a half head start?
Answer by mananth(16946) About Me  (Show Source):
You can put this solution on YOUR website!
the person walking would have walked 1.5*5 = 7.5 miles when the runner starts
the catch up speed is 12-5=7 mph
catch up time = catch up distance / catchup speed
= 7.5/7
=1.07 hours