SOLUTION: two train leave Chicago at the same time, traveling in opposite directions. One travels east at 60 mph and the other travels west at 75 mph. How long will it be before they are 540

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Question 927447: two train leave Chicago at the same time, traveling in opposite directions. One travels east at 60 mph and the other travels west at 75 mph. How long will it be before they are 540 miles apart?
Answer by TimothyLamb(4379) About Me  (Show Source):
You can put this solution on YOUR website!
speed of trains relative to each other:
60 + 75 = 135
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s = d/t
t = d/s
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t = 540/135
t = 4 hours
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