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Watch the Watch

One day Harry and I set our watches together. None of us was aware that my watch was getting faster by 2 min per hour and Harry's watch was getting slower by 1 min per hour. After some time, we discovered that my watch was 1 hr ahead of Harry's watch. Can you find out after how long we noticed this?

SOLUTION : After every hour, my watch would get 3 minutes ahead of Harry's watch. So, for my watch to get one hour ahead of Harry's watch, it should take 20 hours.

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