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In the nation of Partoria, large trucks currently account [#permalink]
 21 Jul 2009, 02:48
Question Stats:
41% (02:23) correct
58% (00:39) wrong based on 12 sessions
In the nation of Partoria, large trucks currently account for 6 percent of miles driven on Partoria's roads but are involved in 12 percent of all highway fatalities. The very largest trucks -those with three trailers- had less than a third of the accident rate of single- and double-trailer trucks. Clearly, therefore, one way for Partoria to reduce highway deaths would be to require shippers to increase their use of triple-trailer trucks. Which of the following, if true, most seriously weakens the argument? (A) No matter what changes Partoria makes in the regulation of trucking, it will have to keep smaller roads off-limits to all large trucks. (B) So far only the best, most experienced drivers for Partorian trucking companies have been driving triple-trailer trucks. (C) Very few fatal collisions involving trucks in Partoria are collisions between two trucks. (D) In Partoria, the safety record of the trucking industry as a whole has improved slightly over the past ten years. (E) In Partoria, the maximum legal payload of a triple-trailer truck is less than three times the maximum legal payload of the largest of the single-trailer trucks. Please share your line of reasoning because I don't understand the OA of this problem.
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Re: CR-triple-trailer trucks (from GMATPrep) [#permalink]
21 Jul 2009, 02:54
B only is relevant. ---- (1:10)
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Re: CR-triple-trailer trucks (from GMATPrep) [#permalink]
21 Jul 2009, 03:38
sudeep wrote: B only is relevant.
----
(1:10) Thanks for quick response, sudeep. I strongly agree with you that only (B) is relevant to the argument. However, I don't feel that this option weaken the argument obviously. So, would you please give me more explanations?
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Re: CR-triple-trailer trucks (from GMATPrep) [#permalink]
21 Jul 2009, 06:49
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RisingForceX wrote: sudeep wrote: B only is relevant.
----
(1:10) Thanks for quick response, sudeep. I strongly agree with you that only (B) is relevant to the argument. However, I don't feel that this option weaken the argument obviously. So, would you please give me more explanations? My reasoning: Trailers types : 1 trailer 2 trailer (largest) 3 trailer - fewer accidents than others What could be the reason - largest are better option for transportation, the drivers that drive largest trucks are better(actually best among the drivers), or they drive on the routes which are less vulnerable to accidents. There could be more reasons but I just picked 3 and the last one, referring to route, is also not relevant as it is neither discussed in the passage nor given as an option. Passage picked the first reason. How can it be weakened? Only if we can prove that other reason was there and not the one picked. So, B points to the second reason.
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Re: CR-triple-trailer trucks (from GMATPrep) [#permalink]
21 Jul 2009, 19:05
well explained sudeep, +1 Kudo.
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Re: CR-triple-trailer trucks (from GMATPrep) [#permalink]
21 Jul 2009, 20:33
+1 ,sudeep.
Awesome explanation. Thank you.
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Re: CR-triple-trailer trucks (from GMATPrep) [#permalink]
13 Aug 2009, 22:32
B>Its not the trucks its the drivers..
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Re: CR-triple-trailer trucks (from GMATPrep) [#permalink]
19 Nov 2009, 05:34
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Quote: In the nation of Partoria, large trucks currently account for 6 percent of miles driven on Partoria's roads but are involved in 12 percent of all highway fatalities. The very largest trucks -those with three trailers- had less than a third of the accident rate of single- and double-trailer trucks. Clearly, therefore, one way for Partoria to reduce highway deaths would be to require shippers to increase their use of triple-trailer trucks.
Which of the following, if true, most seriously weakens the argument?
(A) No matter what changes Partoria makes in the regulation of trucking, it will have to keep smaller roads off-limits to all large trucks - Does not weaken the argument as the restriction applies to all large trucks
(B) So far only the best, most experienced drivers for Partorian trucking companies have been driving triple-trailer trucks - CORRECT. Suggests that the drivers of the should be replaced with more experienced drivers rather than the trucks
(C) Very few fatal collisions involving trucks in Partoria are collisions between two trucks.Out of scope
(D) In Partoria, the safety record of the trucking industry as a whole has improved slightly over the past ten years.Out of scope
(E) In Partoria, the maximum legal payload of a triple-trailer truck is less than three times the maximum legal payload of the largest of the single-trailer trucks.Does not weaken the argument
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Re: CR-triple-trailer trucks (from GMATPrep) [#permalink]
19 Nov 2009, 07:30
Good one!
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Re: CR-triple-trailer trucks (from GMATPrep) [#permalink]
24 Jan 2010, 23:27
If I am not wrong then OA is A for this question. This is from Sets
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Re: CR-triple-trailer trucks (from GMATPrep) [#permalink]
31 Jul 2011, 11:20
I have a confusion about this one. My question is that the author here says the triple trailer trucks are involved in less than 1/3rd road accidents as compared to single and double trailer trucks which would mean that triple trailer trucks are involved in fewer accidents than average to single and double trailer truck ( Suppose single and double trailer trucks are involved in 300 accident then their average is 150 accident/truck where as triple trailer truck is involved in third of the total i.e. 1/3*(300) = 100) then why does author in the last line say the that best way to reduce deaths it to reduce shippers to increase their use to triple trailer truck, which according to the passage is involved in fewer number of accidents.
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Re: CR-triple-trailer trucks (from GMATPrep) [#permalink]
31 Jul 2011, 12:30
UtterNonsense wrote: I have a confusion about this one. My question is that the author here says the triple trailer trucks are involved in less than 1/3rd road accidents as compared to single and double trailer trucks which would mean that triple trailer trucks are involved in fewer accidents than average to single and double trailer truck ( Suppose single and double trailer trucks are involved in 300 accident then their average is 150 accident/truck where as triple trailer truck is involved in third of the total i.e. 1/3*(300) = 100) then why does author in the last line say the that best way to reduce deaths it to reduce shippers to increase their use to triple trailer truck, which according to the passage is involved in fewer number of accidents. Read the question carefully - This is talking about the accident rate and NOT the number of accidents
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Re: CR-triple-trailer trucks (from GMATPrep) [#permalink]
31 Jul 2011, 12:32
RisingForceX wrote: Question - stem In the nation of Partoria, large trucks currently account for 6 percent of miles driven on Partoria's roads but are involved in 12 percent of all highway fatalities. The very largest trucks -those with three trailers- had less than a third of the accident rate of single- and double-trailer trucks. Clearly, therefore, one way for Partoria to reduce highway deaths would be to require shippers to increase their use of triple-trailer trucks.
Accident rate = (total number of accidents)/(total number of miles driven)
LT(1+2+3 -trailer) - 6% miles, 12% fatalities
accident rate - (3-trailer) < (1/3)(1-T) and (3-trailer) < (1/3)(2-T)
Conclusion - (3T use ++) leads to (deaths --)Which of the following, if true, most seriously weakens the argument? (A) No matter what changes Partoria makes in the regulation of trucking, it will have to keep smaller roads off-limits to all large trucks. Road size is not linked to deaths - Wrong(B) So far only the best, most experienced drivers for Partorian trucking companies have been driving triple-trailer trucks. ok - another reason for less deaths - less experienced drivers drive the 1T/2T trucks resulting in less accidents and not because of something in 3T trucks - If the more experienced driver had driven 1T/2T trucks, they would also have had lower accident rate -> lower accidents -> lower deaths(C) Very few fatal collisions involving trucks in Partoria are collisions between two trucks. Does not differentiate the collision b/w 1T/2T/3T trucks(D) In Partoria, the safety record of the trucking industry as a whole has improved slightly over the past ten years. No information about differences in collision of 1T/2T/3T trucks(E) In Partoria, the maximum legal payload of a triple-trailer truck is less than three times the maximum legal payload of the largest of the single-trailer trucks. Payload is not affecting the accidents/deaths as per the argument directly/inference_________________
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Re: CR-triple-trailer trucks (from GMATPrep) [#permalink]
31 Jul 2011, 12:57
krishp84 wrote: RisingForceX wrote: Question - stem In the nation of Partoria, large trucks currently account for 6 percent of miles driven on Partoria's roads but are involved in 12 percent of all highway fatalities. The very largest trucks -those with three trailers- had less than a third of the accident rate of single- and double-trailer trucks. Clearly, therefore, one way for Partoria to reduce highway deaths would be to require shippers to increase their use of triple-trailer trucks.
Accident rate = (total number of accidents)/(total number of miles driven)
LT(1+2+3 -trailer) - 6% miles, 12% fatalities
accident rate - (3-trailer) < (1/3)(1-T) and (3-trailer) < (1/3)(2-T)
Conclusion - (3T use ++) leads to (deaths --)Let's assume 1-T, 2-T and 3-T all travel equal number of miles and for the ease of calculation let's also assume that 1-T and 2-T were involved in 6 accidents/mile each. Then, accident rate (3-T) < (1/3)(1-T) = (1/3)*6 = 2; accident rate(3-T) < 2/mile accident rate (3-T) < (1/3)(1-T) = (1/3)*6 = 2; accident rate(3-T) < 2/mile Total accident rate (3-T) <4/mile. This is still less than the what it is for 1-T and 2-T What am I missing over here?
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Re: CR-triple-trailer trucks (from GMATPrep) [#permalink]
31 Jul 2011, 13:17
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UtterNonsense wrote: Let's assume 1-T, 2-T and 3-T all travel equal number of miles and for the ease of calculation let's also assume that 1-T and 2-T were involved in 6 accidents/mile each.
Then,
accident rate (3-T) < (1/3)(1-T) = (1/3)*6 = 2; accident rate(3-T) < 2/mile
accident rate (3-T) < (1/3)(1-T) = (1/3)*6 = 2; accident rate(3-T) < 2/mile
Total accident rate (3-T) <4/mile. This is still less than the what it is for 1-T and 2-T
What am I missing over here? Rule 1 - Please DO NOT ASSUME anything in question stem in CRIn this question, Large trucks are involved in 6% of miles driven It is the average of (1T,2T,3T) large trucks...Nowhere in the question is it given the differentiation among 1T/2T/3T trucks the number of miles driven, so how can you assume they have driven the same miles? Your Assumption was FALSE...You did not understand the question stem...That is what you were missing.
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Re: CR-triple-trailer trucks (from GMATPrep) [#permalink]
31 Jul 2011, 20:49
I get it now. I misunderstood the question stem. Thanks Krish!
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Re: CR-triple-trailer trucks (from GMATPrep)
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31 Jul 2011, 20:49
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