:In a watch the minute-hand and hour hand coincide after every 65 whole 3/11. How much time does the watch lose or gain per day?
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In 24 hours the hands of hour and minute coincide 22 times. 24 hours equals 24*60=1440 minutes. 1440/22 = 65 and 5/11 minutes. => every 65 and 5/11 min, they coincide.
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