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In a courtyard, one bell rings every 1/4 hour and another bell rings

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In a courtyard, one bell rings every 1/4 hour and another bell rings  [#permalink]

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New post 20 Feb 2017, 09:33
3
00:00
A
B
C
D
E

Difficulty:

  25% (medium)

Question Stats:

80% (01:59) correct 20% (01:46) wrong based on 65 sessions

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In a courtyard, one bell rings every 1/4 hour and another bell rings every 1/5 hour. Both bells ring together at exactly the beginning of each hour. Which of the following gives all the intervals that occur between any two rings of the bells in minutes ?

A. 6 and 9 only
B. 3, 6 and 9
C. 3, 12 and 15
D. 3, 6, 9 and 12
E. 3, 6, 10 and 12

Source: 4GMAT
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Re: In a courtyard, one bell rings every 1/4 hour and another bell rings  [#permalink]

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New post 20 Feb 2017, 09:45
The bells ring at 12 minutes and 15 minutes. So they ring at 1) 12min/15min, 2) 24min/30min 3) 36min/45min 4) 48min/60min

The intervals between the listed times are: 3, 6, 9 and 12 mins.

Answer D.

Alternatively, we should notice that the the equation is linear and any interval of the ringing bells will be a constant-- in this instance "3" So C and E can be eliminated right away.
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Re: In a courtyard, one bell rings every 1/4 hour and another bell rings  [#permalink]

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New post 20 Feb 2017, 09:57
skgmatclub2016 wrote:
In a courtyard, one bell rings every 1/4 hour and another bell rings every 1/5 hour. Both bells ring together at exactly the beginning of each hour. Which of the following gives all the intervals that occur between any two rings of the bells in minutes ?

A. 6 and 9 only
B. 3, 6 and 9
C. 3, 12 and 15
D. 3, 6, 9 and 12
E. 3, 6, 10 and 12

Source: 4GMAT


The question asks for the interval between any two rings of the bells. So, I feel D is not a fool proof answer.
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Re: In a courtyard, one bell rings every 1/4 hour and another bell rings  [#permalink]

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New post 21 Feb 2017, 18:02
Need to find intervals occurred between any two rings. The bells ring at 12 minutes and 15 minutes. So the intervals are 3, 6, 9 and 12 mins.
Option D wins.
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Re: In a courtyard, one bell rings every 1/4 hour and another bell rings  [#permalink]

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New post 16 Apr 2018, 17:13
skgmatclub2016 wrote:
In a courtyard, one bell rings every 1/4 hour and another bell rings every 1/5 hour. Both bells ring together at exactly the beginning of each hour. Which of the following gives all the intervals that occur between any two rings of the bells in minutes ?

A. 6 and 9 only
B. 3, 6 and 9
C. 3, 12 and 15
D. 3, 6, 9 and 12
E. 3, 6, 10 and 12


For every 4th of an hour, bell one rings on minutes 15, 30, 45, and 60.

For every 5th of an hour, bell two rings on minutes 12, 24, 36, 48, and 60.

Since 15 - 12 = 3, 30 - 24 = 6, 45 - 36 = 9 and 60 - 48 = 12, the intervals are 3, 6, 9 and 12.

Answer: D
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Re: In a courtyard, one bell rings every 1/4 hour and another bell rings &nbs [#permalink] 16 Apr 2018, 17:13
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In a courtyard, one bell rings every 1/4 hour and another bell rings

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