The dog runs .4 miles per minute because 24 / 60 = <<24/60=.4>>.4
The rabbit runs .25 miles per minute because 15 / 60 = <<15/60=.25>>.25
We know that .4(Number of Minutes) = .25(Number of Minutes) + .6
Therefore .15(Number of Minutes) = .6
Therefore (Number of Minutes) = 4
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