Algebra Opposite Travel Problem?

BrokenHeartedx3

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I can't remember how to do distance problems, and my homework has several. Can you please help me on this one?

Two cars leave at noon and travel in opposite directions. If one car travels "r" mi/hr and the other travels 1.5 times as fast, how far apart are the cars at 4:00 PM? Give the answer in the simplest form in terms of "r".
 
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