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28 Feb 2016, 08:28
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E
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
15%
(low)
Question Stats:
68% (00:37) correct
32%
(00:35)
wrong
based on 604
sessions
History
Date
Time
Result
Not Attempted Yet
While flying across the country, did Karen ever exceed 650 miles per hour?
(1) Karen flew 3,000 miles.
(2) Karen flew for 5 hours.
(1) Karen flew 3,000 miles.
(2) Karen flew for 5 hours.
28 Feb 2016, 21:49
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(1) Karen flew 3,000 miles.
We only have information about distance flown by Karen . We have no information of average and max speed .
Not sufficient
(2) Karen flew for 5 hours
We only have information about total time of flight .
Not sufficient
Combining 1 and 2 , we get
Average speed = 3000/5 = 600 miles / hour
We have no information about max speed .
Not sufficient
There are 2 possibilities -
Karen flew at a constant speed of 600 miles per hour throughout the journey .
or She her speed varied across the journey - in this case there might be possibility that her max speed was more than 650 miles per hour
Answer E
We only have information about distance flown by Karen . We have no information of average and max speed .
Not sufficient
(2) Karen flew for 5 hours
We only have information about total time of flight .
Not sufficient
Combining 1 and 2 , we get
Average speed = 3000/5 = 600 miles / hour
We have no information about max speed .
Not sufficient
There are 2 possibilities -
Karen flew at a constant speed of 600 miles per hour throughout the journey .
or She her speed varied across the journey - in this case there might be possibility that her max speed was more than 650 miles per hour
Answer E
Updated on: 20 Dec 2019, 08:41
Originally posted by BrentGMATPrepNow on 20 Jun 2017, 09:02.
Last edited by BrentGMATPrepNow on 20 Dec 2019, 08:41, edited 1 time in total.
Last edited by BrentGMATPrepNow on 20 Dec 2019, 08:41, edited 1 time in total.
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Bunuel
NOTE: There's nothing here to suggest that Karen's speed was constant. Sure, she MIGHT have traveled at a constant speed, or her speed may have varied throughout the trip.
Target question: Did Karen's speed ever exceed 650 miles per hour?
Statement 1: Karen flew 3,000 miles
No information about Karen's travel TIME so statement 1 is NOT SUFFICIENT
Consider these two possible scenarios that yield conflicting answers to the target question:
Case a: flying at a constant speed, Karen spent 1 hour flying 3000 miles, in which case her speed was 3000 miles per hour. So, Karen's speed DID exceed 650 miles per hour
Case b: flying at a constant speed, Karen spent 10 hours flying 3000 miles, in which case her speed was 300 miles per hour. So, Karen's speed did NOT exceed 650 miles per hour
Since we cannot answer the target question with certainty, statement 1 is NOT SUFFICIENT
Statement 2: Karen flew for 5 hours
No information about the DISTANCE Karen traveled. So, statement 2 is NOT SUFFICIENT
Consider these two possible scenarios that yield conflicting answers to the target question:
Case a: flying at a constant speed, Karen spent 5 hours flying 5000 miles, in which case her speed was 1000 miles per hour. So, Karen's speed DID exceed 650 miles per hour
Case b: flying at a constant speed, Karen spent 5 hours flying 5 miles, in which case her speed was 1 mile per hour. So, Karen's speed did NOT exceed 650 miles per hour
Since we cannot answer the target question with certainty, statement 2 is NOT SUFFICIENT
Statements 1 and 2 combined
Consider these two possible scenarios that yield conflicting answers to the target question:
Case a: flying at a constant speed, Karen spent 5 hours flying 3000 miles, in which case her speed was 600 miles per hour. So, Karen's speed did NOT exceed 650 miles per hour
Case b: Karen flew 2000 miles (at a constant speed) for 1 hour, and then spent 4 hours flying the remaining 1000 miles. So, Karen's speed DID exceed 650 miles per hour
Since we cannot answer the target question with certainty, the combined statements are NOT SUFFICIENT
Answer:
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