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It takes the pendulum of a clock 7 seconds

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LoneSurvivor
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It takes the pendulum of a clock 7 seconds [#permalink] New post   29 Sep 2019, 08:16
00:00
A
B
C
D
E

Difficulty:

75% (hard)

Question Stats:

13% (01:17) correct 88% (01:36) wrong based on 8 sessions
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It takes the pendulum of a clock 7 seconds to strike 4 o’clock. How much time will it take to strike
11 o’clock?
(a) 18 seconds
(b) 20 seconds
(c) 19.25 seconds
(d) 23.33 seconds
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Official Answer
D
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gmatbalar
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Re: It takes the pendulum of a clock 7 seconds [#permalink] New post   06 Feb 2022, 21:48
Can someone please explain how the OA is D and not C? I assumed the pendulum times will be proportional.

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dhineshpg
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Re: It takes the pendulum of a clock 7 seconds [#permalink] New post   20 Feb 2022, 02:02
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gmatbalar wrote:
Can someone please explain how the OA is D and not C? I assumed the pendulum times will be proportional.

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It takes 7 seconds for a clock for 3 interval movement ('n' hours, 'n-1' intervals)
For 10 interval movements, it takes (7/3)*10 = 21 (1/3) seconds. D is the answer.
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gmatbalar
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Re: It takes the pendulum of a clock 7 seconds [#permalink] New post   20 Feb 2022, 05:25
dhineshpg wrote:
gmatbalar wrote:
Can someone please explain how the OA is D and not C? I assumed the pendulum times will be proportional.

Posted from my mobile device


It takes 7 seconds for a clock for 3 interval movement ('n' hours, 'n-1' intervals)
For 10 interval movements, it takes (7/3)*10 = 21 (1/3) seconds. D is the answer.

Thanks. Your explanation makes sense. The question didn't seem to.
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gmatclubot
Re: It takes the pendulum of a clock 7 seconds [#permalink]
20 Feb 2022, 05:25

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