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Mathematics 8 Online
OpenStudy (anonymous):

two cars leave springfield at noon and travel in opposite directions. if one car travels r miles per hour and the other car travels 1.5 times as fast, how far are the cars apart by 4:00?

OpenStudy (anonymous):

tire combined rate is \[r+1.5r=2.5r\] so in 4 hours they are \[4\times 2.5r=10r\] apart

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