Hands of the clock will coincide with a day total of how many times?
Mine 针完 total polymerization:
If this is the case after 60 seconds finish the grid, the minute hand will go a grid, coincide 22 times.
If the second hand at every 1 frame, the minute hand is moved 1/60 cell cases 3 pointers overlap only twice, the first time is zero o'clock, the 2nd 12 o'clock.
Let t time hour hand and minute hand over the catch k circle clockwise, then 2π × t- (1/6) π × t = k × 2π (k belong to an integer and k ≧ 0) only 22 values k
morning:
12:00 ，1:05 ，2:11，3:16 ，4:22， 5:27， 6:33， 7:38， 8:44 ，9:49 ，10:55
in the afternoon:
12:00， 1:05， 2:11， 3:16， 4:22， 5:27， 6:33， 7:38， 8:44， 9:49，10:55
Source: aliens to Earth
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