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

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Manager
Joined: 08 Feb 2006
Posts: 128
Followers: 1

Kudos [?]: 6 [0], given: 0

A certain clock marks every hour by striking a number of [#permalink]  20 Feb 2006, 13:11
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
Posts: 270
Location: Chennai,India
Followers: 1

Kudos [?]: 3 [1] , given: 0

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.

_________________

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

Manager
Joined: 08 Feb 2006
Posts: 128
Followers: 1

Kudos [?]: 6 [0], given: 0

Thanks for the help.
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