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A man on his way to dinner shortly after...

A man on his way to dinner shortly after 6.00 p.m. observes that the hands of his watch form an angle of `110^o`. Returning before 7.00 p.m. he notices that again the hands of his watch form an angle of `110^o`. Find the number of minutes that he has been away.

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The correct Answer is:
40
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