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Could someone please explain this problem from MGMAT CAT 2

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beater
 Post subject: Could someone please explain this problem from MGMAT CAT 2
 Post Posted: Mon Oct 13, 2008 12:29 pm 
Patrick is cleaning his house in anticipation of the arrival of guests. He needs to vacuum the floors, fold the laundry, and put away the dishes after the dishwasher completes its cycle. If the dishwasher is currently running and has 55 minutes remaining in its cycle, can Patrick complete all of the tasks before his guests arrive in exactly 1 hour?

(1) Vacuuming the floors and folding the laundry will take Patrick 36 minutes.

(2) Putting away the dishes will take Patrick 7 minutes.
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jojo
 Post subject:
 Post Posted: Thu Oct 16, 2008 10:35 am 
Is the correct answer c?
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idiot
 Post subject:
 Post Posted: Thu Oct 16, 2008 11:13 am 
Is the correct answer "d"?
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idiot
 Post subject:
 Post Posted: Thu Oct 16, 2008 11:30 am 
the correct answer is "b".
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Guest
 Post subject:
 Post Posted: Thu Oct 16, 2008 11:37 am 
question- will he be able to finish the tasks?
hint- he has only 5 min left after dishwashing is over (i.e. 55 min later)
statement 1- it will take 36 min to finish these 2 tasks (can be done in dishwashing's 5 min), but what about the iiird one? it can take 2 min or can take 15 min - no data provided - so this statement can't answer our question

statement 2- whether he is able to finish the other two tasks on time or not, no clue
but one thing is there for sure, he can't put away dishes in remaining 5 min (60min-55min).
so this statement answers our question - he can't finish all the 3 tasks

answer is "b"
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idiot
 Post subject:
 Post Posted: Thu Oct 16, 2008 11:39 am 
typo in my last post-
... statement 1- it will take 36 min to finish these 2 tasks (can be done in dishwashing's 55 min), ...
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esledge
 Post subject:
 Post Posted: Mon Oct 27, 2008 6:19 pm 
Offline
ManhattanGMAT Staff


Posts: 901
Location: St. Louis, MO
Exactly. (2) gives a definite no, regardless of the non-dishwashing tasks duration. If you selected (C) or (D) here, you primarily fell prey to a DS logic error: carry-over of statement (1).

_________________
Emily Sledge
Instructor
ManhattanGMAT
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