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605-655 Level|   Tables|            
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RenB
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bb
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Thank you Chetan. A few comments out loud:

Unfortunately due to complexity of how the forum works, I do not think any user will ever be able to post a table. 😢 and I think there are probably ten people on this forum who actually know how to post the tables properly. The only solution I can see, is you posting this table in the proper format or me or someone else who is highly qualified in table formatting. This is at least for the time being until we can figure out better formatting options.

Also, if we lock a topic, a user will be unable to edit it (lock means no replies and no editing). So I would not recommend locking topics unless we want to have no activity in them.

Thank you 🙏
BB.

Posted from my mobile device
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bb
Thank you Chetan. A few comments out loud:

Unfortunately due to complexity of how the forum works, I do not think any user will ever be able to post a table. 😢 and I think there are probably ten people on this forum who actually know how to post the tables properly. The only solution I can see, is you posting this table in the proper format or me or someone else who is highly qualified in table formatting. This is at least for the time being until we can figure out better formatting options.

Also, if we lock a topic, a user will be unable to edit it (lock means no replies and no editing). So I would not recommend locking topics unless we want to have no activity in them.

Thank you 🙏
BB.

Posted from my mobile device
Formatted the table with the help of this excel sheet:

https://gmatclub.com/forum/introducing- ... 29383.html

Thank you 8Harshitsharma
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­You are most welcome, Bunuel. I'm glad that it has already come in handy  :blushing:­
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Hi, could you help with St 3 here
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Hi, can someone please help me with St 3? I'm slightly confused how to answer it.­
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Hi, can someone please help me with St 3? I'm slightly confused how to answer it.­
shivani.saraogi

­Hi Shivani,

Let me try to help you. 

Statement 3 asks you whether Air Tran was the originating airline for the "only" direct flight to Milwaukee; given that the mean speed of each flight in the list was roughly the same.

Let us simplify this, we know \(Mean speed = \frac{Total distance covered in the trip}{Total time taken for the trip}\) Hence, Total time taken ∝ Total distance covered.

The only direct flight to Milwaukee will have the "least" total distance traveled as all other connecting flights will need to cover more distances, traveling via other airports. And from the above proportionality, we know that ⬇️distance traveled => ⬇️Total time taken.

Thus we need to check if Air Tran is the originating airline for the flight with the least total travel time in the given table. If it does answer is Yes else it's No. Sorting the table by Total Trip time(hours) we DO see that Air Tran takes the least time, and thus, is the only direct flight to Milwaukee. So it's a Yes.

I hope this helps you!
­Maybe I am thinking too much. Between two cities, is it possible that the routes chose by different airlines could be different? Thus, even nonstop flights can take different distances. If that stands, 3 will be No. 
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shivani.saraogi
Hi, can someone please help me with St 3? I'm slightly confused how to answer it.­
shivani.saraogi

­Hi Shivani,

Let me try to help you. 

Statement 3 asks you whether Air Tran was the originating airline for the "only" direct flight to Milwaukee; given that the mean speed of each flight in the list was roughly the same.

Let us simplify this, we know \(Mean speed = \frac{Total distance covered in the trip}{Total time taken for the trip}\) Hence, Total time taken ∝ Total distance covered.

The only direct flight to Milwaukee will have the "least" total distance traveled as all other connecting flights will need to cover more distances, traveling via other airports. And from the above proportionality, we know that ⬇️distance traveled => ⬇️Total time taken.

Thus we need to check if Air Tran is the originating airline for the flight with the least total travel time in the given table. If it does answer is Yes else it's No. Sorting the table by Total Trip time(hours) we DO see that Air Tran takes the least time, and thus, is the only direct flight to Milwaukee. So it's a Yes.

I hope this helps you!
­Maybe I am thinking too much. Between two cities, is it possible that the routes chose by different airlines could be different? Thus, even nonstop flights can take different distances. If that stands, 3 will be No. 

Yes, we need to make the basic logical assumption that a connecting flight would take longer travel time than a direct flight because it’ll travel for a longer distance.

Logically thinking, why would there EVER be a direct flight which takes longer than a connecting flight? Airline would just terminate the more time taking, fuel consuming, and prolly more expensive direct flight.🙂

Posted from my mobile device
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8Harshitsharma
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Quote:
­Hi Shivani,

Let me try to help you. 

Statement 3 asks you whether Air Tran was the originating airline for the "only" direct flight to Milwaukee; given that the mean speed of each flight in the list was roughly the same.

Let us simplify this, we know \(Mean speed = \frac{Total distance covered in the trip}{Total time taken for the trip}\) Hence, Total time taken ∝ Total distance covered.

The only direct flight to Milwaukee will have the "least" total distance traveled as all other connecting flights will need to cover more distances, traveling via other airports. And from the above proportionality, we know that ⬇️distance traveled => ⬇️Total time taken.

Thus we need to check if Air Tran is the originating airline for the flight with the least total travel time in the given table. If it does answer is Yes else it's No. Sorting the table by Total Trip time(hours) we DO see that Air Tran takes the least time, and thus, is the only direct flight to Milwaukee. So it's a Yes.

I hope this helps you!
­Maybe I am thinking too much. Between two cities, is it possible that the routes chose by different airlines could be different? Thus, even nonstop flights can take different distances. If that stands, 3 will be No. 
Yes, we need to make the basic logical assumption that a connecting flight would take longer travel time than a direct flight because it’ll travel for a longer distance.

Logically thinking, why would there EVER be a direct flight which takes longer than a connecting flight? Airline would just terminate the more time taking, fuel consuming, and prolly more expensive direct flight.🙂

Posted from my mobile device
­That is true... Considering the 2nd shortest option is much longer, I totally agree your point! THX!­
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8Harshitsharma - i think im a little confused with the language in statement 3. I went with no because Alaska, Continental and United also seem to be operating only one flight. Hence how can we conclude that Tran is the only one?
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thakur91
8Harshitsharma - i think im a little confused with the language in statement 3. I went with no because Alaska, Continental and United also seem to be operating only one flight. Hence how can we conclude that Tran is the only one?
I am not sure how did you come up with the other airlines­ that could be operating only one flight (using which given data point? I don't think you can come up with this conclusion from given information) I think you missed this point from stem:
Quote:
For each option, the originating flight is the first flight in the sequence (or the single flight if it is nonstop)
However, it is clearly mentioned in statement 3 to assume there's "only one" direct flight in the given list of airlines. So the flight with the least travel time should logically be the direct flight - which is Air Tran.
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bb Bunuel chetan2u
You really think S3 is a valid ans?

I myself have been tracking live flights since years and have also worked on private aviation departments. The flights change paths to cover ATC locations. Accordingly, flight times will also increase, as the air distance will change (assuming the constant speed > 800kts in stratospheric conditions, no major turbulence, no delay in takeoffs and landings)

Using that info, time could not be the only factor governing the distance. Also the least time cannot always be the direct flight.
Also don't you think OG should have mentioned these above assumptions in the question itself?­
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bb Bunuel chetan2u
You really think S3 is a valid ans?

I myself have been tracking live flights since years and have also worked on private aviation departments. The flights change paths to cover ATC locations. Accordingly, flight times will also increase, as the air distance will change (assuming the constant speed > 800kts in stratospheric conditions, no major turbulence, no delay in takeoffs and landings)

Using that info, time could not be the only factor governing the distance. Also the least time cannot always be the direct flight.
Also don't you think OG should have mentioned these above assumptions in the question itself?­
­

Speeds are almost the same for all planes ( we are considering ideal situation - we cannot use external extrapolations in gmat ).

If the speeds are same for all planes then, all planes who have a stoppage will take more time than the direct flight takes . Hence Only the one with shortest flight time is the non-stop flight .­
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Bunuel chetan2u 8Harshitsharma Official explanation for 3rd?
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This is a bit confusing to me because it doesn't say which destination is the shortest. For example, how do we know if a 1 stop flight to Seattle is longer than a non stop to Wisconsin
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KarishmaB GMATNinja
Assuming mean speeds of the planes are roughly equal and only one of the airlines listed offers a nonstop flight, Air Tran is that flight’s originating airline.
Can you please explain how c is correct?

I'm not able to understand how to reach to conclusion that Air tran is a non-stop based on the data that it takes the least time to travel.

Also how to use mean speed same info to arrive at the conclusion.

Thanks!
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I still did not understand how s3 is yes. Hoping an expert would pick this up. Would be very helpful
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I still did not understand how s3 is yes. Hoping an expert would pick this up. Would be very helpful
I was stuck for a while, too. But the flight runs b/w two locations only : Milwaukee, Wisconsin, to Seattle, Washington, and a flight with the shortest duration will be the non-stop flight which is [color=#000000]Air Tran, since the statement also states 'only one of the airlines listed offers a nonstop flight'.[/color]
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