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GMAT Diagnostic Test Question 24

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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 16 Jun 2013, 00:27
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Dixon wrote:
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


The point is that we cannot say that bus 1 traveled 96 minutes on the second day.

BELOW IS REVISED VERSION OF THIS QUESTION:

A bus leaves city M and travels to city N at a constant speed, at the same time another bus leaves city N and travels to city M at the same constant speed. After driving for 2 hours they meet at point P. The following day the buses do the return trip at the same constant speed. One bus is delayed 24 minutes and the other leaves 36 minutes earlier. If they meet 24 miles from point P, what is the distance between the two cities?

A. 48
B. 72
C. 96
D. 120
E. 192

Say the distance between the cities is d miles.

Since both buses travel at the same constant speed and leave the cities at the same time then they meet at the halfway, so the first meeting point P, is \frac{d}{2} miles away from M (and N).

Next, since the buses meet in 2 hours then the total time to cover d miles for each bus is 4 hours.

Now, on the second day one bus traveled alone for 1 hour (36min +24min), hence covered 0.25d miles, and 0.75d miles is left to cover.

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

Hence, \frac{d}{2}-24=\frac{0.75d}{2} --> d=192 miles.

Answer: E.

Also discussed here: a-bus-from-city-m-is-traveling-to-city-n-at-a-constant-speed-86478.html

Hope it helps.
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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 25 [#permalink] New post 06 Jan 2014, 02:26
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lindt123 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



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??


Check different solutions here: a-bus-from-city-m-is-traveling-to-city-n-at-a-constant-speed-86478.html

Hope this helps.
_________________

NEW TO MATH FORUM? PLEASE READ THIS: ALL YOU NEED FOR QUANT!!!

PLEASE READ AND FOLLOW: 11 Rules for Posting!!!

RESOURCES: [GMAT MATH BOOK]; 1. Triangles; 2. Polygons; 3. Coordinate Geometry; 4. Factorials; 5. Circles; 6. Number Theory; 7. Remainders; 8. Overlapping Sets; 9. PDF of Math Book; 10. Remainders; 11. GMAT Prep Software Analysis NEW!!!; 12. SEVEN SAMURAI OF 2012 (BEST DISCUSSIONS) NEW!!!; 12. Tricky questions from previous years. NEW!!!;

COLLECTION OF QUESTIONS:
PS: 1. Tough and Tricky questions; 2. Hard questions; 3. Hard questions part 2; 4. Standard deviation; 5. Tough Problem Solving Questions With Solutions; 6. Probability and Combinations Questions With Solutions; 7 Tough and tricky exponents and roots questions; 8 12 Easy Pieces (or not?); 9 Bakers' Dozen; 10 Algebra set. ,11 Mixed Questions, 12 Fresh Meat

DS: 1. DS tough questions; 2. DS tough questions part 2; 3. DS tough questions part 3; 4. DS Standard deviation; 5. Inequalities; 6. 700+ GMAT Data Sufficiency Questions With Explanations; 7 Tough and tricky exponents and roots questions; 8 The Discreet Charm of the DS ; 9 Devil's Dozen!!!; 10 Number Properties set., 11 New DS set.


What are GMAT Club Tests?
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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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