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On Monday morning a certain machine ran continuously at a

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On Monday morning a certain machine ran continuously at a  [#permalink]

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New post Updated on: 08 Oct 2017, 08:39
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74% (00:36) correct 26% (00:44) wrong based on 338 sessions

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On Monday morning a certain machine ran continuously at a uniform rate to fill a production order. At what time did it completely fill the order that morning?

(1) The machine began filling the order at 9:30 a.m.
(2) The machine had filled 1/2 of the order by 10:30 a.m. and 5/6 of the order by 11:10 a.m.

OPEN DISCUSSION OF THIS QUESTION IS HERE: https://gmatclub.com/forum/on-monday-mo ... 66518.html

Originally posted by yogachgolf on 30 Dec 2007, 14:50.
Last edited by Bunuel on 08 Oct 2017, 08:39, edited 2 times in total.
Renamed the topic, edited the question and moved to DS forum.
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Re: On Monday morning a certain machine ran continuously at a  [#permalink]

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New post 30 Dec 2007, 15:02
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B!

1) Insuff. Only tells us when the work started.

2) Suff. Gives us the rate of work and how much of the job completed in x amount of time.

5/6 job - 1/2 job = 1/3 of the job was filled between 10:30 11:10 AM. So the rate is 1/120 (1/3 / 40 mins = 1/120). So.... 1 job is finished in 120 minutes or 2 hours.

OA???
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Re: On Monday morning a certain machine ran continuously at a  [#permalink]

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New post 30 Dec 2007, 15:13
jimmyjamesdonkey wrote:
B!

1) Insuff. Only tells us when the work started.

2) Suff. Gives us the rate of work and how much of the job completed in x amount of time.

5/6 job - 1/2 job = 1/3 of the job was filled between 10:30 11:10 AM. So the rate is 1/120 (1/3 / 40 mins = 1/120). So.... 1 job is finished in 120 minutes or 2 hours.

OA???


I am sure the OA is B. i remember it from OG Quant book
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Re: On Monday morning a certain machine ran continuously at a  [#permalink]

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New post 30 Dec 2007, 15:41
Ravshonbek wrote:
jimmyjamesdonkey wrote:
B!

1) Insuff. Only tells us when the work started.

2) Suff. Gives us the rate of work and how much of the job completed in x amount of time.

5/6 job - 1/2 job = 1/3 of the job was filled between 10:30 11:10 AM. So the rate is 1/120 (1/3 / 40 mins = 1/120). So.... 1 job is finished in 120 minutes or 2 hours.

OA???


I am sure the OA is B. i remember it from OG Quant book


Yeah, the question is from OGQ. Thanks for pointing that out.
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Re: On Monday morning a certain machine ran continuously at a  [#permalink]

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New post 30 Dec 2007, 16:27
Seems like B on its own is good enough

Stat 2 tells us that in 40 mins, 1/3 of the order was completed.

Therefore , to complete entire order takes 40x3 = 120 mins = 2 hours
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Re: On Monday morning a certain machine ran continuously at a  [#permalink]

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New post 08 Nov 2012, 00:58
I got this easy one wrong. Although the OA is B, I disagree with how they use the language.

Watch the language:"... filled 1/2 order BY 10:30AM". BY not AT. As I interpreted, it could be at 10:29AM, or at 10:01AM, or even at 00:01AM (so the machine filled 1/2 the order in 1 minute after midnight). All of the listed hours are BY 10:30AM (and also 11:10AM)

If "BY" is replaced by "AT", then this one is a no-brainer. I'm not a native speaker, is it because I don't understand GMAT English?
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Re: On Monday morning a certain machine ran continuously at a  [#permalink]

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New post 23 Dec 2015, 08:56
catennacio wrote:
I got this easy one wrong. Although the OA is B, I disagree with how they use the language.

Watch the language:"... filled 1/2 order BY 10:30AM". BY not AT. As I interpreted, it could be at 10:29AM, or at 10:01AM, or even at 00:01AM (so the machine filled 1/2 the order in 1 minute after midnight). All of the listed hours are BY 10:30AM (and also 11:10AM)

If "BY" is replaced by "AT", then this one is a no-brainer. I'm not a native speaker, is it because I don't understand GMAT English?

I often make the same mistakes as well. I find it hard to answer questions because I am not sure if I am interpreting the questions correctly.
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Re: On Monday morning a certain machine ran continuously at a  [#permalink]

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New post 08 Oct 2017, 08:40
yogachgolf wrote:
On Monday morning a certain machine ran continuously at a uniform rate to fill a production order. At what time did it completely fill the order that morning?

(1) The machine began filling the order at 9:30 a.m.
(2) The machine had filled 1/2 of the order by 10:30 a.m. and 5/6 of the order by 11:10 a.m.


On Monday morning a certain machine ran continuously at a uniform rate to fill a production order. At what time did it completely fill the order that morning?

(1) The machine began filling the order at 9:30 a.m. Clearly insufficient.

(2) The machine had filled 1/2 of the order by 10:30 a.m. and 5/6 to the order by 11:10 a.m.

In 40 minutes from 10:30 a.m. to 11:10 a.m., 5/6 - 1/2 = 1/3 of the job was done. Thus to do the entire job 3*40 minutes = 120 minutes = 2 hours are needed. Since by 10:30 a.m. half of the job was done, therefore for another half 1 more hour is needed. Therefore the entire job was done by 11:30 a.m. Sufficient.

Answer: B.

OPEN DISCUSSION OF THIS QUESTION IS HERE: https://gmatclub.com/forum/on-monday-mo ... 66518.html
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Re: On Monday morning a certain machine ran continuously at a &nbs [#permalink] 08 Oct 2017, 08:40
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