SOLUTION: A long distance runner started on a course running at an average speed of 6 mph. one-half hour later, a second runner began the same course at an average speed of 7mph. How long a

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Question 433975: A long distance runner started on a course running at an average speed of 6 mph. one-half hour later, a second runner began the same course at an average speed of 7mph. How long after the second runner started did the second runner overtake the first runner?
Answer by mananth(16946) About Me  (Show Source):
You can put this solution on YOUR website!
Runner I 6 mph
Runner II 7 mph

Difference in time= 90 minutes
Train Awill have covered 9 miles before Runner II starts

catch up distance= 9 miles
catch up speed = 7-6 mph
catch up speed = 1 mph

Catchup time = catchup distance/catch up speed
catch up time= 9/1
catch up time= 9 hours