GMAT Catch-Up Rate Question

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Jeff Miller, the head GMAT instructor at Target Test Prep, teaches how to quickly solve a catch-up rate GMAT question.
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why we didn't put (x - 0.5) for shandra

strocker
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Pretty sure this is incorrect and the answer is 90 mins. It should be (x - 0.5), not (x + 0.5).

zachhunter