We know that the minute hand turns 360 and the hour hand turns 30, that is, the minute hand turns 1 and the hour hand turns 1/2, that is, the minute hand turns1,that is to say, we can catch up with the hour hand1/kloc-0. Then the minute hand turned120/(11/2) =1440/11and just caught up with the hour hand. At this time, the two overlap, and the angle is 1440/.