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Mathematics 7 Online
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?

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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