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OpenStudy (anonymous):
A train left Shawnee traveling due west at 90 miles per hour. A car left Shawnee at the same time traveling due east at 60 miles per hour. How much time will pass before the train and car are 405 miles apart?
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OpenStudy (anonymous):
The relative speed of the train vs the car (and vice versa) is the sum of speeds. And you know that Speed=Distance/Time. The rest you do it
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