Gmat 数学OG11th 绿皮书110题： .A certain clock marks every hour by striking a number of times equal to the hour and the time interval between strokes. At 6:00 the time lapse between the beginning of the first stroke and the end of he 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?
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发表于 2009-1-6 00:04:00
