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AbdurRakib
Joined: 11 May 2014
Last visit: 03 Mar 2026
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Concentration: Finance, Leadership
Schools: Wharton '20 Yale '20 Tepper '20
GPA: 2.81
WE:Business Development (Real Estate)
05 Jun 2016, 14:27
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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:
65%
(hard)
Question Stats:
59% (02:16) correct
41%
(02:21)
wrong
based on 281
sessions
History
Date
Time
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Not Attempted Yet
Did a train arrive at station X no earlier than 4:00 p.m. and no later than 8:00 p.m. on Tuesday?
(1) 36 hours after the train arrived, it was between 6 a.m. and 10:00 a.m. on Thursday.
(2) 36 hours before the train arrived, it was between 3:00 a.m. and 7:30 a.m. on Monday
(1) 36 hours after the train arrived, it was between 6 a.m. and 10:00 a.m. on Thursday.
(2) 36 hours before the train arrived, it was between 3:00 a.m. and 7:30 a.m. on Monday
06 Jun 2016, 13:59
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AbdurRakib
Dear AbdurRakib
I'm happy to help.
This is a clever question. Statement #1: 36 hours after the train arrived, it was between 6 a.m. and 10:00 a.m. on Thursday.
Well, 24 hours before that, 12 hours after the train, was between 6 a.m. and 10:00 a.m. on Wednesday. Then, 12 hours before that, the time of the train, would have been between 6 p.m. and 10:00 p.m. on Tuesday.
The train could have left at 7:15 pm on Tuesday, which would give a "yes" to the prompt question.
The train could have left at 9:30 pm on Tuesday, which would give a "no" to the prompt question.
Because two answers to the prompt are possible, we do not have the information we need to give a definitive answer. The first statement, alone and by itself, is not sufficient.
Now, forget all about statement #1.
Statement #2: 36 hours before the train arrived, it was between 3:00 a.m. and 7:30 a.m. on Monday.
Well, 24 hours after that, 12 hours before the train, was between 3:00 a.m. and 7:30 a.m on Tuesday. Then, 12 hours after that, the time of the train, would have been between 3:00 p.m. and 7:30 p.m. on Tuesday.
The train could have left at 7:15 pm on Tuesday, which would give a "yes" to the prompt question.
The train could have left at 3:15 pm on Tuesday, which would give a "no" to the prompt question.
Because two answers to the prompt are possible, we do not have the information we need to give a definitive answer. The first statement, alone and by itself, is not sufficient.
Combined statement.
Statement #1: 36 hours after the train arrived, it was between 6 a.m. and 10:00 a.m. on Thursday.
Statement #2: 36 hours before the train arrived, it was between 3:00 a.m. and 7:30 a.m. on Monday.
The only region allowed by both is the overlap, 6 p.m. and 7:30 p.m. on Tuesday. The train's departure time has to be within that region, and everything in that region is after 4:00 pm and before 8:00 pm, so we can give a definitive "yes" to the prompt question. Because we can give a definitive answer, we must have sufficient information.
Both statements sufficient together but not separately. OA = (C)
Mike
