LSAT 108 – Section 3 – Question 18

LSAT 108 - Section 3 - Question 18

February 2000

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Question
QuickView		 Type Tags Answer
Choices		 Curve Question
Difficulty		 Psg/Game/S
Difficulty		 Explanation
PT108 S3 Q18
+LR
Must be false +MBF
A
4%
162
B
18%
162
C
10%
161
D
63%
169
E
4%
161
153
161
170
 +Hardest 147.273 +SubsectionMedium

Chelas and Stelma are required to leave their respective stations immediately to pursue any prisoner who attempts to escape from their sector. Furthermore, unless they are pursuing such a prisoner, Chelas and Stelma are forbidden to leave their stations until their replacements have arrived. On May 11 at 9 P.M., when Chelas and Stelma finished the four-hour shift in their sector and their replacements arrived, it was discovered that Chelas had violated these rules and Stelma had not.

Summary
For both C and S, if a prisoner tries to escape from their sector, C and S must leave their respective stations to pursue the prisoner.
If they are not pursuing an escaped prisoner, C and S cannot leave their stations until their replacements have arrived.
On May 11 at 9pm, C and S finished a four-hour shift and their replacements arrived at the end.
C had violated the rules described. S had not violated the rules described.

Notable Valid Inferences
There’s no clear inference to draw, because there are many ways in which C could have violated the rules and S would not violate the rules. Let’s use process of elimination to identify what must be false.

A
Chelas and Stelma were at their respective stations at 9 P.M.
Could be true. C could have violated the rules by leaving his station and coming back before the end of the shift. Or C could have violated by failing to pursue a prisoner. S could have stayed at her station the whole time. Or she could have pursued an escaped prisoner.
B
Stelma left her station before 9 P.M. but Chelas did not.
Could be true. S could have left to pursue an escaped prisoner. And C could have violated by failing to pursue that escaped prisoner.
C
Chelas left his station before 9 P.M. but Stelma did not.
Could be true. C could have violated by leaving the station even though a prisoner wasn’t trying to escape. S could have followed the rules and stayed at her station.
D
A prisoner attempted to escape from Chelas and Stelma’s sector at 7 P.M. and neither Chelas nor Stelma left his or her station before 9 P.M.
Must be false. If a prisoner tried to escape from the sector at 7pm, S had to leave her station to pursue the prisoner, because we know she followed the rules.
E
A prisoner attempted to escape from Chelas and Stelma’s sector at 7 P.M. and both Chelas and Stelma left their stations before 9 P.M.
Could be true. S could have followed the rules by chasing the escaped prisoner. C could have violated the rules by leaving the station but for some other reason besides chasing the prisoner.

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LSAT PrepTest 108 Explanations

Section 1 - Reading Comprehension

Section 2 - Logical Reasoning

Section 3 - Logical Reasoning

Section 4 - Reading Comprehension

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