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Director
Status: 1,750 Q's attempted and counting
Affiliations: University of Florida
Joined: 09 Jul 2013
Posts: 513
Location: United States (FL)
Schools: UFL (A)
GMAT 1: 600 Q45 V29
GMAT 2: 590 Q35 V35
GMAT 3: 570 Q42 V28
GMAT 4: 610 Q44 V30
GPA: 3.45
WE: Accounting (Accounting)
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Kudos [?]: 746 [3] , given: 630

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03 Oct 2013, 04:31
3
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Difficulty:

85% (hard)

Question Stats:

48% (02:30) correct 52% (01:27) wrong based on 304 sessions

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The Harptown Transport Society reports that the Silver Bullet train has the fewest delays per rush-hour period
of any high-speed train. This shows that the Silver Bullet train is one of the most efficient trains currently in use.

Which of the following, if true, most seriously weakens the argument in the advertisement?

(A) The Harptown Transport Society report listed many non-high-speed trains in other metropolitan areas
that were more frequently delayed than the Silver Bullet train.

(B) In recent years more travelers have regularly ridden the Silver Bullet train than any other high-speed train.

(C) High-speed trains are more likely to be delayed during rush hour than any other type of train.

(D) The difference between the number of delays on the Silver Bullet train and that for other high-speed trains
is quite pronounced.

(E) The Harptown Transport Society updates its findings regarding train delays only once a year.

Source: GMAT Hacks - 091713
[Reveal] Spoiler: OA

Last edited by avohden on 07 Oct 2013, 08:44, edited 4 times in total.
If you have any questions
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03 Oct 2013, 05:33
Imo c
Silver bullet train ( high speed train) is the most efficient of all trains.

C says that high speed trains are more likely than any other type of train to get delayed clearly weakens it

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Director
Status: 1,750 Q's attempted and counting
Affiliations: University of Florida
Joined: 09 Jul 2013
Posts: 513
Location: United States (FL)
Schools: UFL (A)
GMAT 1: 600 Q45 V29
GMAT 2: 590 Q35 V35
GMAT 3: 570 Q42 V28
GMAT 4: 610 Q44 V30
GPA: 3.45
WE: Accounting (Accounting)
Followers: 26

Kudos [?]: 746 [1] , given: 630

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03 Oct 2013, 05:37
1
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Official Explanation

Answer: C This is a classic example of a scope shift. The evidence (the first sentence) compares the Silver Bullet to other "high-speed trains." The conclusion compares it to all trains. Just because a train has few delays relative to other high-speed trains doesn't mean it has few delays (or is "efficient") compared to ALL trains. Look for a choice that points out the scope shift. Choice (C) does that. If high-speed trains are often delayed, then argument is weakened. It exposes the flaw in the argument, which is along the lines of "Alex is the smartest ‘D' student in the class." (C) is correct.
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12 Oct 2013, 01:38
1
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Sometimes thinking too hard can also be deleterious. C was an obvious choice. I thought really hard and switched to A.
Senior Manager
Status: Student
Joined: 26 Aug 2013
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Location: France
Concentration: Finance, General Management
Schools: EMLYON FT'16
GMAT 1: 650 Q47 V32
GPA: 3.44
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Kudos [?]: 61 [0], given: 401

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02 Feb 2014, 12:52
avohden wrote:

The Harptown Transport Society reports that the Silver Bullet train has the fewest delays per rush-hour period
of any high-speed train. This shows that the Silver Bullet train is one of the most efficient trains currently in use.

Which of the following, if true, most seriously weakens the argument in the advertisement?

(A) The Harptown Transport Society report listed many non-high-speed trains in other metropolitan areas
that were more frequently delayed than the Silver Bullet train.

(B) In recent years more travelers have regularly ridden the Silver Bullet train than any other high-speed train.

(C) High-speed trains are more likely to be delayed during rush hour than any other type of train.

(D) The difference between the number of delays on the Silver Bullet train and that for other high-speed trains
is quite pronounced.

(E) The Harptown Transport Society updates its findings regarding train delays only once a year.

Source: GMAT Hacks - 091713

C and E are the only obvious.

for me E is better.

The Harptown Transport Society updates its findings regarding train delays only once a year ==> Then it is not a current observation, but an observation based on last year data...

Perhaps C weakens better...
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15 Dec 2014, 06:48
Paris75 wrote:
avohden wrote:

The Harptown Transport Society reports that the Silver Bullet train has the fewest delays per rush-hour period
of any high-speed train. This shows that the Silver Bullet train is one of the most efficient trains currently in use.

Which of the following, if true, most seriously weakens the argument in the advertisement?

(A) The Harptown Transport Society report listed many non-high-speed trains in other metropolitan areas
that were more frequently delayed than the Silver Bullet train.

(B) In recent years more travelers have regularly ridden the Silver Bullet train than any other high-speed train.

(C) High-speed trains are more likely to be delayed during rush hour than any other type of train.

(D) The difference between the number of delays on the Silver Bullet train and that for other high-speed trains
is quite pronounced.

(E) The Harptown Transport Society updates its findings regarding train delays only once a year.

Source: GMAT Hacks - 091713

C and E are the only obvious.

for me E is better.

The Harptown Transport Society updates its findings regarding train delays only once a year ==> Then it is not a current observation, but an observation based on last year data...

Perhaps C weakens better...

I think C is definitely better. It's a classic example of scope shift, where they are applying findings in a very specific case and generalizing to encompass all cases.

E is possible, but not the best.
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15 Jun 2016, 12:24
Hello from the GMAT Club VerbalBot!

Thanks to another GMAT Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos).

Want to see all other topics I dig out? Follow me (click follow button on profile). You will receive a summary of all topics I bump in your profile area as well as via email.
Manager
Joined: 18 Aug 2013
Posts: 149
Location: India
Concentration: Operations, Entrepreneurship
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Kudos [?]: 42 [0], given: 123

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15 Jun 2016, 17:19
avohden wrote:

The Harptown Transport Society reports that the Silver Bullet train has the fewest delays per rush-hour period
of any high-speed train. This shows that the Silver Bullet train is one of the most efficient trains currently in use.

Which of the following, if true, most seriously weakens the argument in the advertisement?

(A) The Harptown Transport Society report listed many non-high-speed trains in other metropolitan areas
that were more frequently delayed than the Silver Bullet train.

(B) In recent years more travelers have regularly ridden the Silver Bullet train than any other high-speed train.

(C) High-speed trains are more likely to be delayed during rush hour than any other type of train.

(D) The difference between the number of delays on the Silver Bullet train and that for other high-speed trains
is quite pronounced.

(E) The Harptown Transport Society updates its findings regarding train delays only once a year.

Source: GMAT Hacks - 091713

Can Narrow it down to C & E.

But C creates ambiguity as it states "High-speed trains are more likely to be delayed during rush hour than any other type of train".This tells us that even though high speed trains are delayed during rush hours,Silver bullet has the fewest delays during that time.Clearly,silver bullet is more efficient than any other train as it has fewer delays even though fast trains are delayed.

IMO E is the right choice.
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