[計量] clock strokes
A certain clock marks every hour by striking a number of times equal
to the hour, and the time required for a stroke is exactly equal to
the time interval between strokes. At 6:00 the time lapse between the
beginning of the first stroke and the end of the last stroke is 22 seconds.
At 12:00 , how many seconds elapse between the beginning of the first
stroke and the end of the last stroke?
A) 72
B) 50
C) 48
D) 46
E) 44
不太了這題的意思 @@
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08/25 21:00, , 1F
08/25 21:00, 1F
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08/25 21:01, , 2F
08/25 21:01, 2F
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08/25 21:01, , 3F
08/25 21:01, 3F
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08/27 02:30, , 4F
08/27 02:30, 4F
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72
146
75
190