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GMAT Diagnostic Test Question 24

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Re: GMAT Diagnostic Test Question 25 [#permalink] New post 03 Dec 2011, 12:05
this was tricky....moreover it dosent look like a 600 level ques......Should have been 700+...

Or may be i am confused because of the wordings....
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Re: GMAT Diagnostic Test Question 25 [#permalink] New post 18 Jan 2012, 07:32
Great question, but I'd agree: There's no way this would be a 600-level-question. 700 sounds about right.
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Re: GMAT Diagnostic Test Question 25 [#permalink] New post 15 Jun 2013, 18:17
I tried something else and it doesn't add up.

Expressed in minutes, on day one, the distance to P is 120*s (120mins=2 hrs, s=speed)

Then for bus 1 on the second day, distance covered is (120-24)*s =96s

So shouldn't distance to P (120*s) minus 24 miles equal 96s? As in 120s-24=96s, which would calculate to s=1mile/min=60mph
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Re: GMAT Diagnostic Test Question 25 [#permalink] New post 14 Aug 2013, 14:52
Bunuel wrote:
Distance between the cities d.

First meeting point \frac{d}{2}, as both buses travel at the same constant speed and leave the cities same time they meet at the halfway.

Total time to cover the d 4 hours, as the buses meet in 2 hours.

On the second day first bus traveled alone 1 hour (36min +24min), hence covered 0.25d, and 0.75d is left cover.

They meet again at the halfway of 0.75d, which is 24 miles from \frac{d}{2}:

\frac{d}{2}-24=\frac{0.75d}{2}

d=192


You destroyed that problem and took its lunch money too. So this is a great opportunity for me to ask a question about a concept that I've never fully understood. When you create this equation:

\frac{d}{2}-24=\frac{0.75d}{2}

What makes you subtract 24 instead of add 24? I feel like either one signifies "distance from", right?
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Re: GMAT Diagnostic Test Question 25 [#permalink] New post 15 Aug 2013, 01:55
Expert's post
vandygrad11 wrote:
Bunuel wrote:
Distance between the cities d.

First meeting point \frac{d}{2}, as both buses travel at the same constant speed and leave the cities same time they meet at the halfway.

Total time to cover the d 4 hours, as the buses meet in 2 hours.

On the second day first bus traveled alone 1 hour (36min +24min), hence covered 0.25d, and 0.75d is left cover.

They meet again at the halfway of 0.75d, which is 24 miles from \frac{d}{2}:

\frac{d}{2}-24=\frac{0.75d}{2}

d=192


You destroyed that problem and took its lunch money too. So this is a great opportunity for me to ask a question about a concept that I've never fully understood. When you create this equation:

\frac{d}{2}-24=\frac{0.75d}{2}

What makes you subtract 24 instead of add 24? I feel like either one signifies "distance from", right?


The simple fact that d/2 is greater than 0.75(d/2).

Does this make sense?
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Re: GMAT Diagnostic Test Question 24 [#permalink] New post 10 Nov 2013, 09:09
Hey guys, just to let you know that I downloaded the PDF and the the problem says: "If they meet 48 miles from point P, ..." instead of 24 miles.

Regards,
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Re: GMAT Diagnostic Test Question 25 [#permalink] New post 05 Jan 2014, 21:47
Bunuel wrote:
Distance between the cities d.

First meeting point \frac{d}{2}, as both buses travel at the same constant speed and leave the cities same time they meet at the halfway.

Total time to cover the d 4 hours, as the buses meet in 2 hours.

On the second day first bus traveled alone 1 hour (36min +24min), hence covered 0.25d, and 0.75d is left cover.

They meet again at the halfway of 0.75d, which is 24 miles from \frac{d}{2}:

\frac{d}{2}-24=\frac{0.75d}{2}

d=192



I am not sure whether this is a good question...but can we do this problem by plugging in the answer choices...for eg. assumin 'd' to be 192,120...etc??? ..?? is it possible in any way??
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Re: GMAT Diagnostic Test Question 24 [#permalink] New post 10 Mar 2014, 13:02
The latest diagnostic test version (v6.2) does not have the exact wording of the original post nor of Bunuel's revision.

I skipped the question when I took the test because I did not know what they were asking. Upon reading the question in this thread, I solved it fairly quickly.
Re: GMAT Diagnostic Test Question 24   [#permalink] 10 Mar 2014, 13:02
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