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# A certain clock marks every hour by striking a number of

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Manager
Joined: 17 May 2007
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A certain clock marks every hour by striking a number of [#permalink]

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28 Jul 2007, 11:22
This topic is locked. If you want to discuss this question please re-post it in the respective forum.

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

Senior Manager
Joined: 28 Feb 2007
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28 Jul 2007, 14:21
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D.
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.
28 Jul 2007, 14:21
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