Mork starts reading 50 minutes ahead of Mindy. You might have saved yourself some work by noticing that Mindy gains 10 pages an hour on Mork, since she reads 10 pages an hour faster. You can also work out the problem algebraically. So it takes 2.5 hours for Mindy to catch Mork. The source of this solution is The Kaplan Edge .
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Please comment . A SureMath solution. Copyright 1998, Howard C. McAllister.