Mark M. answered 06/23/16
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Alex is 14 minutes (8:30 - 8:16) ahead of Bridget.
For him that is (14/60)(4) miles, or 14/15 mile
Alex: d = 4(t)
Bridget: d + 14/15 = 6(t), or d = 6t - 14/15
4t = 6t - 14/15
-2t = -14/15
t = 7/15
7/15 hour is 28 minutes.
Bridget catches up at 8:44 (8:16 + 0:28).