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

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Manager
Joined: 08 Feb 2006
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A certain clock marks every hour by striking a number of [#permalink]

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20 Feb 2006, 13:11
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 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
Senior Manager
Joined: 11 Jan 2006
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21 Feb 2006, 07:40
1
KUDOS
ok the basic idea is suppose the clock strikes 3 |---|---|
| - the strike and --- - gap the time for both is equal , say - 5 secs
so the timelapse required for the clock to stike 3 5+5+5+5+5 = 25 sec

now, it is given for the clock to stike 6 - the lapse was 22 secs , which means 6 strikes + 5 gaps = 11 ==> 22 sec / 11 = 2 sec for each.

so for the clock to strike 12 - it required 12 stikes and 11 gapz = 46 sec.

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vazlkaiye porkalam vazltuthan parkanum.... porkalam maralam porkalthan maruma

Manager
Joined: 08 Feb 2006
Posts: 126
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Kudos [?]: 9 [0], given: 0

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21 Feb 2006, 14:19
Thanks for the help.
21 Feb 2006, 14:19
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