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# A certain cathedral bell marks every hour by ringing a number of times

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Manager
Joined: 13 Sep 2016
Posts: 120
GMAT 1: 800 Q51 V51
A certain cathedral bell marks every hour by ringing a number of times  [#permalink]

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19 Oct 2016, 06:25
1
1
00:00

Difficulty:

25% (medium)

Question Stats:

77% (01:16) correct 23% (01:35) wrong based on 61 sessions

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A certain cathedral bell marks every hour by ringing a number of times equal to the current hour ( for example, at 2:00PM, the bell rings twice). Each toll of the bell lasts for three seconds, with 2 seconds of silence between tolls. At 9:00AM, how many seconds elapse between the beginning of the first toll and the end of the last toll?

a) 52
b) 48
c) 45
d) 43
e) 40

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Re: A certain cathedral bell marks every hour by ringing a number of times  [#permalink]

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19 Oct 2016, 07:29
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alanforde800Maximus wrote:
A certain cathedral bell marks every hour by ringing a number of times equal to the current hour ( for example, at 2:00PM, the bell rings twice). Each toll of the bell lasts for three seconds, with 2 seconds of silence between tolls. At 9:00AM, how many seconds elapse between the beginning of the first toll and the end of the last toll?

a) 52
b) 48
c) 45
d) 43
e) 40

9:00AM means there will be 9 tolls
Since each interval is of 3 seconds , the tolls will take 27 seconds

Further , interval between tools is 2 seconds and it will look something like this -

Toll==2sec==Toll==2sec==Toll==2sec==........Toll

Check there will be 8 gaps / intervals for 9AM...

So, the total intervals will be 8*2 = 16 seconds..

SO, the total time taken will be 27 + 16 = 43

Hence answer will be (D) 43 seconds...

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Manager
Joined: 29 Aug 2008
Posts: 110
Re: A certain cathedral bell marks every hour by ringing a number of times  [#permalink]

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19 Oct 2016, 22:59
There will be 9 tolls and (9-1) = 8 wait periods between tolls.

So total time = 9*3 + 8*2 = 27 + 16 = 43 secs

HTH
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Joined: 02 Sep 2009
Posts: 55271
Re: A certain cathedral bell marks every hour by ringing a number of times  [#permalink]

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20 Oct 2016, 06:41
1
alanforde800Maximus wrote:
A certain cathedral bell marks every hour by ringing a number of times equal to the current hour ( for example, at 2:00PM, the bell rings twice). Each toll of the bell lasts for three seconds, with 2 seconds of silence between tolls. At 9:00AM, how many seconds elapse between the beginning of the first toll and the end of the last toll?

a) 52
b) 48
c) 45
d) 43
e) 40

Similar question to practice: a-certain-clock-marks-every-hour-by-striking-a-number-of-tim-167784.html
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Re: A certain cathedral bell marks every hour by ringing a number of times  [#permalink]

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16 Mar 2018, 05:58
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Re: A certain cathedral bell marks every hour by ringing a number of times   [#permalink] 16 Mar 2018, 05:58
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