SOLUTION: Two trains leave Dallas traveling the same direction on parallel tracks. One train is traveling at 72 mph and the other is traveling 66 mph. How long before they are 45 miles apart

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Question 386407: Two trains leave Dallas traveling the same direction on parallel tracks. One train is traveling at 72 mph and the other is traveling 66 mph. How long before they are 45 miles apart? .
Answer by mananth(16946) About Me  (Show Source):
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Two trains leave Dallas traveling the same direction on parallel tracks. One train is traveling at 72 mph and the other is traveling 66 mph. How long before they are 45 miles apart? .
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Train A 72 mph
Train B = 66 mph
difference in speed = 6 mph.
...
t=d/r
t=45/6
t=7.5 hours
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45 miles apart after 7.5 hours
...
m.ananth@hotmail.ca