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Look at math problems at night
The clock face is divided into 60 squares, the minute hand moves one square every minute, and the hour hand moves112 squares every minute. From 6 o'clock, the first time it becomes a right angle, the minute hand goes 15 grid, and the second time it goes 45 grid. In fact, this is catching up with the question:

15 ÷ (1-1/2) =180/11,that is, from 6 o'clock,180.

45 ÷ ( 1- 1/ 12) = 540/ 1 1,

End at 6: 540/ 1 1.

Total 360/ 1 1 min =32 and 1 1 min.