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A certain clock marks every hour by striking a number of

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A certain clock marks every hour by striking a number of [#permalink] New post 28 Jul 2007, 11:22
A certain clock marks every hour by striking a number of times equal to the hour, and the time required for a stoke 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 elaspe between the beginning of the first stroke and the end of the last stroke?

(A) 72
(B) 50
(C) 48
(D) 46
(E) 44

Please explain your answer.
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 [#permalink] New post 28 Jul 2007, 14:21
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at 6:00: The #of strokes 6 and interval 5 so (6+5)*n=22 then n=2 sec
at 12:00 : the # of strokes 12 and interval 11. so (12+11)*2=46.
  [#permalink] 28 Jul 2007, 14:21
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A certain clock marks every hour by striking a number of

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