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01 Apr 2026, 19:00
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C
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
95%
(hard)
Question Stats:
38% (02:20) correct
62%
(02:08)
wrong
based on 74
sessions
History
Date
Time
Result
Not Attempted Yet
An inspection agency follows these guidelines for newly laid pipelines: all of the pipeline up to kilometer 60 is to be inspected; in addition, 2/3 of any portion of the pipeline between kilometer 60 and kilometer 210 that exists is to be inspected; and no part of the pipeline beyond kilometer 210 is to be inspected. The agency was assigned to inspect a newly laid pipeline in accordance with these guidelines. How long was the pipeline?
(1) A total of 160 kilometers of the pipeline was inspected.
(2) The length of the pipeline that was inspected was at least 16/21 of the total length of the pipeline.
Edited the stem.
(1) A total of 160 kilometers of the pipeline was inspected.
(2) The length of the pipeline that was inspected was at least 16/21 of the total length of the pipeline.
Edited the stem.
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04 Apr 2026, 01:45
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GMAT Club Official Solution:
A pipeline inspection team was assigned to inspect a newly laid pipeline. According to the inspection plan, all of the first 60 kilometers of the pipeline were inspected, 2/3 of the next 150 kilometers were inspected, and no part of the pipeline beyond the first 210 kilometers was inspected. How long was the pipeline?
(1) A total of 160 kilometers of the pipeline was inspected.
The maximum possible inspected length is
60 + 2/3 * 150 = 160
So for 160 kilometers to have been inspected, the pipeline must have been at least 210 kilometers long.
Not sufficient.
(2) The length of the pipeline that was inspected was at least 16/21 of the total length of the pipeline.
From the inspection plan, the greatest possible inspected length is
60 + 2/3 * 150 = 160
If the pipeline had been longer than 210 kilometers, the fraction inspected would have been 160/(more than 210), which is less than 160/210 = 16/21. Since (2) says that the fraction inspected was at least 16/21, the pipeline must have been no more than 210 kilometers long. Not sufficient.
(1) + (2):
From (1), the pipeline was at least 210 kilometers long.
From (2), the pipeline was no more than 210 kilometers long.
Therefore, the pipeline was exactly 210 kilometers long.
Sufficient.
Answer: C.
A pipeline inspection team was assigned to inspect a newly laid pipeline. According to the inspection plan, all of the first 60 kilometers of the pipeline were inspected, 2/3 of the next 150 kilometers were inspected, and no part of the pipeline beyond the first 210 kilometers was inspected. How long was the pipeline?
(1) A total of 160 kilometers of the pipeline was inspected.
The maximum possible inspected length is
60 + 2/3 * 150 = 160
So for 160 kilometers to have been inspected, the pipeline must have been at least 210 kilometers long.
Not sufficient.
(2) The length of the pipeline that was inspected was at least 16/21 of the total length of the pipeline.
From the inspection plan, the greatest possible inspected length is
60 + 2/3 * 150 = 160
If the pipeline had been longer than 210 kilometers, the fraction inspected would have been 160/(more than 210), which is less than 160/210 = 16/21. Since (2) says that the fraction inspected was at least 16/21, the pipeline must have been no more than 210 kilometers long. Not sufficient.
(1) + (2):
From (1), the pipeline was at least 210 kilometers long.
From (2), the pipeline was no more than 210 kilometers long.
Therefore, the pipeline was exactly 210 kilometers long.
Sufficient.
Answer: C.
General Discussion
02 Apr 2026, 22:59
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So the question is slightly tricky with the use of word ‘that exists’ meaning pipeline may or may not even be till 210 kms
Let the total length be L
GIVEN ;
first 60 km is inspected
Next 2/3 * (L-60) is inspected
If pipeline is more than or equal to 210 then 60+150*2/3=160 km is inspected
Statement 1: total inspected length given is 160 km
So if L=210 we get inspected length as 160km
However if L> 210km then also we get 160km. —- insufficient
Statement 2:
It says the length of pipeline inspected was at least 16/21 L
Let’s say if L is 60<L<=210
Equation becomes 60+(L-60) *2/3 >= 16/21 L
Solving this we get L<= 210 but no exact value of L
Which satisfy the equation
Now if L >210
16/21 L <= 160
L<= 210 but we took L >210 so this doesn’t satisfy our condition so No Solution —— insufficient
Together
From statement 1: L>=210
From statement 2: L = 60<L<=210
So L=210km —— sufficient Ans C
Let the total length be L
GIVEN ;
first 60 km is inspected
Next 2/3 * (L-60) is inspected
If pipeline is more than or equal to 210 then 60+150*2/3=160 km is inspected
Statement 1: total inspected length given is 160 km
So if L=210 we get inspected length as 160km
However if L> 210km then also we get 160km. —- insufficient
Statement 2:
It says the length of pipeline inspected was at least 16/21 L
Let’s say if L is 60<L<=210
Equation becomes 60+(L-60) *2/3 >= 16/21 L
Solving this we get L<= 210 but no exact value of L
Which satisfy the equation
Now if L >210
16/21 L <= 160
L<= 210 but we took L >210 so this doesn’t satisfy our condition so No Solution —— insufficient
Together
From statement 1: L>=210
From statement 2: L = 60<L<=210
So L=210km —— sufficient Ans C
