simultaneous linear equations

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asked May 27, 2013 by anonymous
A boy started reading sometime between 3PM and 4PM and stopped reading sometime between 5PM and 6PM. He found that the hands of the watch interchanged their places. When did the boy started reading? When did he stopped reading? How long did he read? [Hint : When an hour's needle moves one hour, minute's needed moves 60 minutes.

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