4.My husband's watch gains 2 minutes every watch
and my watch loses 1 minute for each hour. One day, we were late to marriage because the difference between the time in the two watches was 1 hr and we looked at the slow watch. When did we last set our watches to the same time?
Everyone hour the watches gains 3 mins difference. So at the end of 20 hrs it would be 60 mins diff. Hence the answer is 20 hrs before they set their timings.