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# In the past decade, two Motorlux models

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Director
Joined: 07 Aug 2011
Posts: 533
GMAT 1: 630 Q49 V27

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26 Feb 2015, 10:02
2
9
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Difficulty:

75% (hard)

Question Stats:

61% (02:31) correct 39% (02:45) wrong based on 578 sessions

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In the past decade, two Motorlux models, the T-300, a sports car, and the AG-75, a sports utility vehicle, have been manufactured with the same timing chain, which controls the timing of the engines valves: when the engine is running at a higher RPM, there is more strain on the timing belt. Recent evidence indicates that this particular brand of timing chain has a usable life of about 135,000 miles, somewhat less the 200,000 miles life typical of standard timing chains. Although the same model of timing belt has been used for both models of cars, the incidence of timing chain failure is considerably higher in the AG-75 than in the T-300. This is mostly likely because ______________________

Which of the following, if true, most logically completes the argument?

A) where legal, drivers of the T-300 have been known to drive it at speeds in excessive of 100 mph; whereas the AG-75 is rarely driven that fast.
B) it is common for sports utility vehicles to tow heavy objects, such as motor boats; whereas sport cars almost never tow anything.
C) sports cars typically drive on relatively flat paved surfaces only, whereas sports utility vehicles often are driven on rough off-road surfaces.
D) timing chains are automatically replaced when the entire transmission systems is repaired or replaced, and, unlike sports utility vehicles, sport cars such as the T-300 tend to experience transmission systems problems before the 100,000 mile mark.
E) the timing chains typically used in most other models of sports cars on the market are of higher quality than the timing chains typically used in most other models of sports utility vehicles on the market.

Hi mikemcgarry,
Could you please help me in understanding that why are we bringing in outside information for getting the OA ?

Thanks,
Lucky
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26 Feb 2015, 11:48
There are a lot of such official questions that bring outside information. As you can notice, the questions ask 'if, true'. That is why it is reasonable to expect outside information.
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12 Mar 2015, 19:49
1
This is a fill in the blank question which is asking for additional premise to reason the failure incidents. Additional premise can well be an outside
information. If the question were asking about a conclusion then outside information could have been an doubtful option.
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Director
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12 Mar 2015, 21:44
aniteshgmat1101 wrote:
This is a fill in the blank question which is asking for additional premise to reason the failure incidents. Additional premise can well be an outside
information. If the question were asking about a conclusion then outside information could have been an doubtful option.

yups , agree.

now ,after reading through CR Books, i do understand various question types and what is acceptable for one type and not for the other .
what should i do for improving my speed though ?
do volumes of questions ? i start exhausting if i do it in bulk .
Intern
Joined: 19 Mar 2015
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19 Mar 2015, 07:47
Hi!

Can you guys please explain why it's D and not B?

Cheers,

P
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19 Mar 2015, 08:19
1
PaulFrederick wrote:
Hi!

Can you guys please explain why it's D and not B?

Cheers,

P

note this a paradox category of critical reasoning question .

Facts :
High speed results in more strain at chain .
both SUV and Racing car has the same chain .
chain has a life of 135000 miles.
Both vehicles are using the same chain but the one which is driven at slow speed have more cases of chain failure.

Option : B further strengthens the paradox by saying that SUV has extra weight apart from its own weight so it will run even slower than the normal SUV, and we are given that high speed results in chain failure.

Option D: Racing car's goes on repair every 10000 miles and it's chain is replaced in every repair , i.e. the chain is replaced even before it is exhausted completely. this explains why we have fewer cases of chain failure in racing cars .

hope it helps!

thanks
Manager
Joined: 07 Dec 2009
Posts: 91
GMAT Date: 12-03-2014

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23 Sep 2015, 09:14

IMO , both the options explain the paradox...

Thanks
Current Student
Joined: 18 Jun 2016
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04 Sep 2016, 05:44
Lucky2783 wrote:
timing of the engines valves: when the engine is running at a higher RPM, there is more strain on the timing belt. Recent evidence indicates that this particular brand of timing chain has a usable life of about 135,000 miles, somewhat less the 200,000 miles life typical of standard timing chains.

Note that the Limiting Factor given in the Stimulus is the Distance - 135,000 miles and not the Speed or Strain. Therefore, every option talking about speed or strain is a trap.

A) where legal, drivers of the T-300 have been known to drive it at speeds in excessive of 100 mph; whereas the AG-75 is rarely driven that fast.
Speed is not given as the Limiting Factor for life of Chain.

B) it is common for sports utility vehicles to tow heavy objects, such as motor boats; whereas sport cars almost never tow anything.
You may argue that towing heavy objects exerts a strain on the chain but the chains break after 135,000 miles and no data about strain is given.

C) sports cars typically drive on relatively flat paved surfaces only, whereas sports utility vehicles often are driven on rough off-road surfaces.
Surface may lead to higher strain or higher speed both of which are out of scope for the aforementioned reasons.

D) timing chains are automatically replaced when the entire transmission systems is repaired or replaced, and, unlike sports utility vehicles, sport cars such as the T-300 tend to experience transmission systems problems before the 100,000 mile mark.
This option Clearly says that in T-300 the chains are generally replaced before 100,000 mile mark. Therefore, incidences of them failing in T-300 are less than those in AG-75.

E) the timing chains typically used in most other models of sports cars on the market are of higher quality than the timing chains typically used in most other models of sports utility vehicles on the market.
Out of Scope. Comparison is between AG-75 & T-300 only.
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04 Sep 2016, 09:55
Lucky2783 wrote:
In the past decade, two Motorlux models, the T-300, a sports car, and the AG-75, a sports utility vehicle, have been manufactured with the same timing chain, which controls the timing of the engine's valves: when the engine is running at a higher RPM, there is more strain on the timing belt. Recent evidence indicates that this particular brand of timing chain has a usable life of about 135,000 miles, somewhat less the 200,000 miles life typical of standard timing chains. Although the same model of timing belt has been used for both models of cars, the incidence of timing chain failure is considerably higher in the AG-75 than in the T-300. This is mostly likely because ______________________

Which of the following, if true, most logically completes the argument?

 Similarity in T-300 and the AG-75 : Manufactured with the same timing chain which controls the timing of the engine's valvesHigher RPM = More strain on the timing beltThe timing chain (Used in the two Motorlux models ) has a usable life of about 135,000 miles which is less the 200,000 miles life typical of standard timing chains.The incidence of timing chain failure is considerably higher in the AG-75 than in the T-300.

There must be a reason for the frequent failure of timing chain of AG-75 as compared to the timing chain of T-300 , so find an option which brings out the difference / reason.

(A) If speed is a factor then there must have been frequent failure of T-300 than AG-75 ( converse of what has been presented in the conclusion )
(B) Out of scope , fails to bring out the difference in usage of timing chains of T-300 & AG-75

(C) Out of scope , Talks about sports cars Vs sports utility vehicles , where Sports cars are out of Scope in the current context

(D) BEST , If preventive maintenance is carried out in T-300 then cases of chain failures will be less, if same preventive maintenance is not carried out in AG-75 then comparatively there will be frequent failures.

(E) Out of scope compares timing chains of Motorlux models with other models in the market...

Hence IMHO clearly with (D)
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19 Feb 2017, 02:12
Good question ! I was confused between B,C and D. Then noticed that B and C bring in outside information that, however, is not supported by argument.
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13 Mar 2017, 06:05
D is the best fit. Gives a reason as to why other model experiences frequent trouble.
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10 Jan 2018, 11:31
Lucky2783 wrote:
In the past decade, two Motorlux models, the T-300, a sports car, and the AG-75, a sports utility vehicle, have been manufactured with the same timing chain, which controls the timing of the engines valves: when the engine is running at a higher RPM, there is more strain on the timing belt. Recent evidence indicates that this particular brand of timing chain has a usable life of about 135,000 miles, somewhat less the 200,000 miles life typical of standard timing chains. Although the same model of timing belt has been used for both models of cars, the incidence of timing chain failure is considerably higher in the AG-75 than in the T-300. This is mostly likely because ______________________

Which of the following, if true, most logically completes the argument?

A) where legal, drivers of the T-300 have been known to drive it at speeds in excessive of 100 mph; whereas the AG-75 is rarely driven that fast.
B) it is common for sports utility vehicles to tow heavy objects, such as motor boats; whereas sport cars almost never tow anything.
C) sports cars typically drive on relatively flat paved surfaces only, whereas sports utility vehicles often are driven on rough off-road surfaces.
D) timing chains are automatically replaced when the entire transmission systems is repaired or replaced, and, unlike sports utility vehicles, sport cars such as the T-300 tend to experience transmission systems problems before the 100,000 mile mark.
E) the timing chains typically used in most other models of sports cars on the market are of higher quality than the timing chains typically used in most other models of sports utility vehicles on the market.

Hi mikemcgarry,
Could you please help me in understanding that why are we bringing in outside information for getting the OA ?

Thanks,
Lucky

There is no outside knowledge in this question. Using POE, you still get the answer. The traditional method still helps you to find the strengthener. The question type is a mix (explanation, strengthen) There are many details, but too few transition words. Nevertheless, B,C,E are out of scope for sure.
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25 May 2018, 19:36

Official Explanation Magoosh:

The credited answer is (D). If most T-300 sports cars get transmission problems before 100,000 miles, then when the transmission is repaired, the timing belt will be replaced, and thus when the T-300 is between 100,000 miles and 200,000 miles, it will already have a new timing belt and will not need one, whereas the AG-75 SUVs, having not needed a transmission overhaul, would be much more likely to experience timing belt failure in the 100,000 miles to 200,000 miles range.

If drivers of the T-300 speed more, then we would expect those engines to experience higher range RPMs more frequently, which would lead us to expect those timing belts would fail more often --- which is the opposite of what the paragraph says. Choice (A) is incorrect.

The paragraph gives us no information about how towing might influence RPM, so we cannot draw any conclusion. Choice (B) is incorrect.

The paragraph gives us no information about how driving on different terrains might influence RPM, so we cannot draw any conclusion. Choice (C) is incorrect.

The quality level of the timing belts used in other sports cars or other SUVs tells us nothing about why the T-300 and the AG-75, using the exact same timing belt, have different results. Choice (E) is irrelevant, so it is incorrect.
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Re: In the past decade, two Motorlux models &nbs [#permalink] 25 May 2018, 19:36
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