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RAGCT 2015 Day 1: A system that combines radar and infrared

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RAGCT 2015 Day 1: A system that combines radar and infrared [#permalink]

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A system that combines radar and infrared can be installed in cargo ships and passenger liners to provide a ship’s crew with a warning if another vessel is in the shipping lane directly ahead. The early warning allows a ship’s captain to attempt an abrupt course change to avert a possible collision. Even though cargo ships and passenger liners need a considerable distance to maneuver and that most warnings are false, such an early warning system undoubtedly better protects cargo and passengers. Which one of the following, if true, most strengthens the argument?

A. The system can detect not only the physical presence of a ship by radar but it can also detect a ship's heat signature by infrared.

B. A maritime safety commission report determined that over 82% of the system’s warnings were false.

C. Ship collisions in the major oceanic shipping lanes are extremely rare.

D. The risk of a cargo ship or passenger liner being involved in a collision is substantially greater at port than at sea.

E. Abrupt course changes do not involve risk to a ship’s cargo or passengers.

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Re: RAGCT 2015 Day 1: A system that combines radar and infrared [#permalink]

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:) fingers crossed. waiting for the OA. when can I expect the update on OA?

Last edited by grr8pe on 13 Jul 2015, 12:26, edited 2 times in total.

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Re: RAGCT 2015 Day 1: A system that combines radar and infrared [#permalink]

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souvik101990 wrote:
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A system that combines radar and infrared can be installed in cargo ships and passenger liners to provide a ship’s crew with a warning if another vessel is in the shipping lane directly ahead. The early warning allows a ship’s captain to attempt an abrupt course change to avert a possible collision. Even though cargo ships and passenger liners need a considerable distance to maneuver and that most warnings are false, such an early warning system undoubtedly better protects cargo and passengers. Which one of the following, if true, most strengthens the argument?

A. The system can detect not only the physical presence of a ship by radar but it can also detect a ship's heat signature by infrared.

B. A maritime safety commission report determined that over 82% of the system’s warnings were false.

C. Ship collisions in the major oceanic shipping lanes are extremely rare.

D. The risk of a cargo ship or passenger liner being involved in a collision is substantially greater at port than at sea.

E. Abrupt course changes do not involve risk to a ship’s cargo or passengers.

Day 1 Question of the Verbal Contest: Race Against the GMAT Club Timer
Please make sure to post a brief reply without revealing your solution to enter the contest!


Can you please post the correct answer?

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Re: RAGCT 2015 Day 1: A system that combines radar and infrared [#permalink]

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I like these promotions :D . I hope this question is about usefulness of the device . Waiting for the OA .

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Re: RAGCT 2015 Day 1: A system that combines radar and infrared [#permalink]

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Imo: A
Argument is about the radar and infrared helping the cargo and passengers. To strengthen this we must look for the ans which means these rays really helpful for cargo or passengers or both. And only one option does and gives some other features of being these rays.
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Re: RAGCT 2015 Day 1: A system that combines radar and infrared [#permalink]

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A. The system can detect not only the physical presence of a ship by radar but it can also detect a ship's heat signature by infrared.
Already given that the system has system will use IR and radar. how is heat signature useful nowhere mentioned.


B. A maritime safety commission report determined that over 82% of the system’s warnings were false.
Already given warnings are false. can't strengthen anyways


C. Ship collisions in the major oceanic shipping lanes are extremely rare.
So how will system be useful ?


D. The risk of a cargo ship or passenger liner being involved in a collision is substantially greater at port than at sea.
Thats what I marked because system might not be useful at sea but it can protect the ship while at port.

E. Abrupt course changes do not involve risk to a ship’s cargo or passengers.
But how is system more useful in this case ?

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Re: RAGCT 2015 Day 1: A system that combines radar and infrared [#permalink]

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Is the OA - E? Since it eliminates a possibility of weakness in the statement

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Re: RAGCT 2015 Day 1: A system that combines radar and infrared [#permalink]

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Quite a tricky one!...i choose D.

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Re: RAGCT 2015 Day 1: A system that combines radar and infrared [#permalink]

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Question seemed extremely simple, so I won't be surprised if there is a trap!

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Re: RAGCT 2015 Day 1: A system that combines radar and infrared [#permalink]

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IMO E. It eliminates the only possible weakness of the argument and hence strengthens it.
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Re: RAGCT 2015 Day 1: A system that combines radar and infrared [#permalink]

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A system that combines radar and infrared can be installed in cargo ships and passenger liners to provide a ship’s crew with a warning if another vessel is in the shipping lane directly ahead. The early warning allows a ship’s captain to attempt an abrupt course change to avert a possible collision. Even though cargo ships and passenger liners need a considerable distance to maneuver and that most warnings are false, such an early warning system undoubtedly better protects cargo and passengers. Which one of the following, if true, most strengthens the argument?

Option saying abrupt changes are safe and can be done without any harm will ensure the safety and hence strengthen the argument.
because this is the assumption here.

A. The system can detect not only the physical presence of a ship by radar but it can also detect a ship's heat signature by infrared.
Not relevant

B. A maritime safety commission report determined that over 82% of the system’s warnings were false.
It may be false but does it harm the cargos or passengers? It rather weakens if it harms.

C. Ship collisions in the major oceanic shipping lanes are extremely rare.
Not relevant

D. The risk of a cargo ship or passenger liner being involved in a collision is substantially greater at port than at sea.
Not relevant

E. Abrupt course changes do not involve risk to a ship’s cargo or passengers.
Yes this option explains it.

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Re: RAGCT 2015 Day 1: A system that combines radar and infrared [#permalink]

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rockinsitu wrote:
A system that combines radar and infrared can be installed in cargo ships and passenger liners to provide a ship’s crew with a warning if another vessel is in the shipping lane directly ahead. The early warning allows a ship’s captain to attempt an abrupt course change to avert a possible collision. Even though cargo ships and passenger liners need a considerable distance to maneuver and that most warnings are false, such an early warning system undoubtedly better protects cargo and passengers. Which one of the following, if true, most strengthens the argument?

Option saying abrupt changes are safe and can be done without any harm will ensure the safety and hence strengthen the argument.
because this is the assumption here.

A. The system can detect not only the physical presence of a ship by radar but it can also detect a ship's heat signature by infrared.
Not relevant

B. A maritime safety commission report determined that over 82% of the system’s warnings were false.
It may be false but does it harm the cargos or passengers? It rather weakens if it harms.

C. Ship collisions in the major oceanic shipping lanes are extremely rare.
Not relevant

D. The risk of a cargo ship or passenger liner being involved in a collision is substantially greater at port than at sea.
Not relevant

E. Abrupt course changes do not involve risk to a ship’s cargo or passengers.
Yes this option explains it.


Im with you - E, but for other reasons.
A - Not relevant to the argument
B - Not relevant to the argument
C - This would weaken rather than strengthen (though also irrelevant)
D - This would weaken rather than strengthen
E - Correct choice (IMHO) as it eliminates possibility of weakness - conclusion is that the new system better PROTECTS the ship´s cargo and passengers, we could argue that it may protect the ship from collision but in doing so, passengers may get hurt, which would actually kill the argument. With this option we no longer can attack the argument

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Re: RAGCT 2015 Day 1: A system that combines radar and infrared [#permalink]

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Asssumption: Such a security system would not pose any harm to the cargo while manoeuvring.....

The answer is E...

Abrupt course changes do not involve risk to a ship’s cargo or passengers

So the system would not pose any harm to the passengers or the Cargo and hence strengthens the assumption.
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Re: RAGCT 2015 Day 1: A system that combines radar and infrared [#permalink]

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souvik101990 wrote:
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A system that combines radar and infrared can be installed in cargo ships and passenger liners to provide a ship’s crew with a warning if another vessel is in the shipping lane directly ahead. The early warning allows a ship’s captain to attempt an abrupt course change to avert a possible collision. Even though cargo ships and passenger liners need a considerable distance to maneuver and that most warnings are false, such an early warning system undoubtedly better protects cargo and passengers. Which one of the following, if true, most strengthens the argument?

A. The system can detect not only the physical presence of a ship by radar but it can also detect a ship's heat signature by infrared.

B. A maritime safety commission report determined that over 82% of the system’s warnings were false.

C. Ship collisions in the major oceanic shipping lanes are extremely rare.

D. The risk of a cargo ship or passenger liner being involved in a collision is substantially greater at port than at sea.

E. Abrupt course changes do not involve risk to a ship’s cargo or passengers.

Day 1 Question of the Verbal Contest: Race Against the GMAT Club Timer
Please make sure to post a brief reply without revealing your solution to enter the contest!


My answer and approach is described below:
Breaking down the para:
background->radar and infrared warns of ship/container lying directly ahead.
Premise->Can be used to avoid collisions
Counter Premise->Most warnings are false
Conclusion->this warning system better protects cargo as well as ships

Going through the options:
A. The system can detect not only the physical presence of a ship by radar but it can also detect a ship's heat signature by infrared.->if it is so then it will help ships in avoiding collision

B. A maritime safety commission report determined that over 82% of the system’s warnings were false.->emphasizes counter premise but does not hit the conclusion - irrelevant

C. Ship collisions in the major oceanic shipping lanes are extremely rare.->not relevant; does not relate the collisions and radars

D. The risk of a cargo ship or passenger liner being involved in a collision is substantially greater at port than at sea.->it is possible that this use case is more relevant to situation where cargo ships DO NOT have substantial space to maneuver

E. Abrupt course changes do not involve risk to a ship’s cargo or passengers.->Not relevant; we need to hit the conclusion


I chose A for an answer, however, looking back I am convinced it should be D. Awaiting OA.


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Re: RAGCT 2015 Day 1: A system that combines radar and infrared [#permalink]

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Not so complex question. Possibility of a trap in the options. Fingers crossed.

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Re: RAGCT 2015 Day 1: A system that combines radar and infrared [#permalink]

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Good qn. Tricky logic. Hope I am correct.
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Re: RAGCT 2015 Day 1: A system that combines radar and infrared [#permalink]

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Re: RAGCT 2015 Day 1: A system that combines radar and infrared [#permalink]

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A system that combines radar and infrared can be installed in cargo ships and passenger liners to provide a ship’s crew with a warning if another vessel is in the shipping lane directly ahead. The early warning allows a ship’s captain to attempt an abrupt course change to avert a possible collision. Even though cargo ships and passenger liners need a considerable distance to maneuver and that most warnings are false, such an early warning system undoubtedly better protects cargo and passengers. Which one of the following, if true, most strengthens the argument?

A. The system can detect not only the physical presence of a ship by radar but it can also detect a ship's heat signature by infrared.

B. A maritime safety commission report determined that over 82% of the system’s warnings were false.

C. Ship collisions in the major oceanic shipping lanes are extremely rare.

D. The risk of a cargo ship or passenger liner being involved in a collision is substantially greater at port than at sea.

E. Abrupt course changes do not involve risk to a ship’s cargo or passengers.


Official Explanation
Type: Strengthen
Boil It Down: System warns captain -> Better protection
Missing Information: There are not any significant downsides to the system
Goal: Find the option that reinforces the notion that cargo and passengers will be better protected

This option just describes some of the details of HOW the technology works, but better knowing how it works in no way helps us know that it actually works, or will ultimately better protect cargo and passengers. By gaining a brief run-through of the systems involved, we are in no way better able to say that the system is more likely to achieve its goal—protection.

No effect. A high volume of false alarms wouldn’t help reinforce the positive outcome of the system, in fact, if anything, this option appears to even weaken the notion of how effective the system is if false alarms make up that big a fraction of the system’s warnings.

We’re not concerned with how rare or how common collisions are. Even if they’re rare, preventing them could be extremely valuable in protecting cargo, passengers, and ships. The notion of how rare such collisions are in no way reinforces the argument.

This option is utterly useless. It stresses the severity of locations outside of the scope of where we need it (avoiding collisions in sea lanes). This is what we call an Out Of Focus option. It just has no obvious impact on the argument concerning collision warning in sea lanes.

Yes! Although this option doesn’t DEFINITIVELY prove that the system will better protect cargo or passengers, it rules out a factor that could completely undercut the value of the system. Consider the alternative: what if the course changes did involve risk to a ship’s cargo or passengers? Then the system, especially if it had a significant number of false alarms, could, surprisingly, end up harming a ship’s cargo or passengers. By ruling out that risk, we reinforce the prediction that a ship’s cargo or passengers will be better protected.


Bigger GMAT Picture: Eliminating a likely alternative factor can reinforce the predicted outcome.
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Re: RAGCT 2015 Day 1: A system that combines radar and infrared [#permalink]

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vikal wrote:
Imo: A
Argument is about the radar and infrared helping the cargo and passengers. To strengthen this we must look for the ans which means these rays really helpful for cargo or passengers or both. And only one option does and gives some other features of being these rays.


Hi vikal,

Thanks for weighing in, and for your speed in doing so! Option A merely describes the system's sensors, but that would only strengthen the argument if we assume that these features contributes to the goal of better protection of cargo and passengers (the goal isn't detection--the goal is protection). Does knowing what gizmos the system uses automatically help show that the system is any good at better protecting cargo and passengers? No.

This option would be like running through all of the specs on a car, but would that necessarily help prove an argument that the car is likely to win the race? Same flaw in A here.
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Re: RAGCT 2015 Day 1: A system that combines radar and infrared [#permalink]

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New post 20 Jul 2015, 21:49
PUNEETSCHDV wrote:
A. The system can detect not only the physical presence of a ship by radar but it can also detect a ship's heat signature by infrared.
Already given that the system has system will use IR and radar. how is heat signature useful nowhere mentioned.


B. A maritime safety commission report determined that over 82% of the system’s warnings were false.
Already given warnings are false. can't strengthen anyways


C. Ship collisions in the major oceanic shipping lanes are extremely rare.
So how will system be useful ?


D. The risk of a cargo ship or passenger liner being involved in a collision is substantially greater at port than at sea.
Thats what I marked because system might not be useful at sea but it can protect the ship while at port.

E. Abrupt course changes do not involve risk to a ship’s cargo or passengers.
But how is system more useful in this case ?

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Hi PUNEETSCHDV and jayanthjanardhan,

Thanks for chiming in on the thread! The problem with D is that how do we know the system is any good at all at port? With D, we'd have to assume that that it is and on top of that, according to the prompt the system scans in front of the ship. While at port, a forward-looking sensor might not be of much use at all.
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Re: RAGCT 2015 Day 1: A system that combines radar and infrared   [#permalink] 20 Jul 2015, 21:49

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