Two vehicles leave the same location at exactly the same time, one traveling due north at r miles per hour and the other traveling due south at r + 10 miles per hour. In how many hours will the two vehicles be d miles apart?

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Two vehicles leave the same location at exactly the same time, one traveling due north at <em>r</em> miles per hour and the other traveling due south at <em>r</em> + 10 miles per hour. In how many hours will the two vehicles be <em>d</em> miles apart?<br><img alt='images' src='https://www.fatskills.com/images3/gmat/e0223-01.jpg'>