A woman leaves home in a automobile on a business trip. Twenty minutes later, her husband discovers that she left her briefcase behind and decides to overtake her in another car. The husband knows that his wife averages 45 mi/hr and he averages 60 mi/hr. How long will it be until he overtakes his wife?

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Answers

2014-03-17T19:26:35+08:00
 it will take 1 hour for him to reach her wife...
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