SOLUTION: 2. Two runners start at the same point and run in opposite directions. One runs at 6 miles per hour and the other runs at 8 miles per hour. In how many hours will they be 21 miles

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Question 344628: 2. Two runners start at the same point and run in opposite directions. One runs at 6 miles per hour and the other runs at 8 miles per hour. In how many hours will they be 21 miles apart?
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Answer by mananth(16946) About Me  (Show Source):
You can put this solution on YOUR website!
since they are running in opposite directions their effective speed will be 6+8 =14 mph.
distance =21 miles
time+=+distance+%2F+speed+
=21/14
=1.5 hours
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