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Watch
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Answer :

If the 65 minutes be counted on the face of the same watch, then the problem would be impossible: for the hands must coincide every 655/11 minutes as shown by its face, and it matters not whether it runs fast or slow;
but if it is measured by true time, it gains 5/11 of a minute in 65 minutes, or 60/143 of a minute per hour.




Math Genius