Need help with Math word problem

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Two trains leave a train station at the same time.  One travels north at 9 miles per hour. The other train travels south at 11 miles per hour.  In how many hours will the two trains be 92 miles apart

Oct 30th, 2015

Thank you for the opportunity to help you with your question!

assume after t hours they are 92 miles apart, then we have 

9*t+11*t= 92

20t = 92

t = 4.6 hrs 

Please let me know if you need any clarification. I'm always happy to answer your questions.
Oct 30th, 2015

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Oct 30th, 2015
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Oct 30th, 2015
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