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A certain vent releases steam every 20 minutes. If the vent

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GMAT Club Legend
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A certain vent releases steam every 20 minutes. If the vent [#permalink] New post 27 Mar 2018, 16:19
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99% (00:28) correct 0% (00:00) wrong based on 7 sessions
A certain vent releases steam every 20 minutes. If the vent releases steam at 6:25 p.m., which of the following could be a time at which the vent releases steam?

A. 9:15 p.m.
B. 10:40 p.m.
C. 11:00 p.m.
D. 12:20 p.m.
E. 1:05 a.m.

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Question: 2
Page: 549
[Reveal] Spoiler: OA

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Re: A certain vent releases steam every 20 minutes. If the vent [#permalink] New post 29 Mar 2018, 19:05
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Since there are 60 minutes in an hour, and since 60 is cleanly divisible by 20, we can see that the vent will release steam exactly 3 times per hour. So it will always vent at times ending in :25, :45, and :05. The only one of these options that appears is answer choice E.
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Re: A certain vent releases steam every 20 minutes. If the vent [#permalink] New post 04 Apr 2018, 15:54
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Explanation

Rather than listing out the actual times, figure out the pattern.

The vent releases steam at 25, 45, and then 5 minutes after 6 p.m., and repeats this pattern every hour thereafter.

Only choice (E) fits the pattern.
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Re: A certain vent releases steam every 20 minutes. If the vent [#permalink] New post 10 May 2018, 06:45
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sandy wrote:
A certain vent releases steam every 20 minutes. If the vent releases steam at 6:25 p.m., which of the following could be a time at which the vent releases steam?

A. 9:15 p.m.
B. 10:40 p.m.
C. 11:00 p.m.
D. 12:20 p.m.
E. 1:05 a.m.


Since the vent releases steam every 20 minutes, and we are given that it releases steam at 6:25 pm, we we that whatever time it will release steam, the time must have 5 as the “last” digit. Therefore, we can eliminate choices B, C and D.

Now let’s write couple more times the vent will release steam after 6:25 pm:

6:45 pm, 7:05 pm, 7:25 pm, 7:45 pm, 8:05 pm, …

We see that if we only focus on the minutes and not the hour, the time the vent releases steam is always at X:45, X:05 and X:25. Therefore, only choice E can be the correct answer.

Answer: E
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Re: A certain vent releases steam every 20 minutes. If the vent   [#permalink] 10 May 2018, 06:45
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