Take 12 hour as a cycle. Clockwise 1, minute hand 12. That is, the minute hand exceeds the hour hand12-1=1,that is, the hour hand and the minute hand overlap 1 1 times (every time the minute hand exceeds the hour hand, it will overlap). Because the rotation speed of the hour hand and the minute hand is fixed, the time interval of each coincidence is the same. The interval of each coincidence is (12 * 60)/11= 65.45 minutes.

The title literally means "the hour hand and the minute hand are in a straight line". There are two situations.

One is the coincidence of the hour and minute hands. Then the result is that the interval between two coincidences is 65.5 minutes.

The other is that the hour hand and the minute hand point in opposite directions. At this time, the minute hand is more than half a turn of the hour hand, and the overlapping time is more than half a turn. (12*60)/22=32.7 minutes