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04 May 2017, 05:10
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B
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
25%
(medium)
Question Stats:
76% (01:48) correct
24%
(01:54)
wrong
based on 453
sessions
History
Date
Time
Result
Not Attempted Yet
Sam leaves Town X at 9 am and drives due north at 50 mph towards Town Y. An hour later, Julie leaves Town X and drives due south toward Town Z. At what time, are the two cars 90 miles apart?
(1) The distance from Town Y to Town Z is 210 miles.
(2) Sam average speed is 12% slower than Julie's.
(1) The distance from Town Y to Town Z is 210 miles.
(2) Sam average speed is 12% slower than Julie's.
(1) The distance from Town Y to Town Z is 210 miles.
Since we need to find out the position of Sam and Julie,
it is not enough to know the distance between the towns,
in order to calculate at what time the cars are 90 miles apart(Insufficient)
(2) Sam average speed is 12% slower than Julie's.
Since we know that Sam is 12% slower than Julie, we can find out the speed at which Julie travels.
In the one hour Sam leaves he travels 50 miles towards Town X. We can find out
,using the relative speed, how much more time it will take them to travel exactly 90 miles apart (Sufficient)(Option B)
Correcting solution!
Since we need to find out the position of Sam and Julie,
it is not enough to know the distance between the towns,
in order to calculate at what time the cars are 90 miles apart(Insufficient)
(2) Sam average speed is 12% slower than Julie's.
Since we know that Sam is 12% slower than Julie, we can find out the speed at which Julie travels.
In the one hour Sam leaves he travels 50 miles towards Town X. We can find out
,using the relative speed, how much more time it will take them to travel exactly 90 miles apart (Sufficient)(Option B)
Correcting solution!
Updated on: 01 Apr 2020, 05:32
Originally posted by BrentGMATPrepNow on 04 May 2017, 06:21.
Last edited by BrentGMATPrepNow on 01 Apr 2020, 05:32, edited 1 time in total.
Last edited by BrentGMATPrepNow on 01 Apr 2020, 05:32, edited 1 time in total.
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Bunuel
Nice question, Bunuel!
This is an expanding gap question, with both people leaving Town X and traveling in OPPOSITE DIRECTIONS.
Target question: At what time, are the two cars 90 miles apart?
Given: Sam leaves Town X at 9 am and drives due north at 50 mph towards Town Y. An hour later, Julie leaves Town X and drives due south toward Town Z.
Statement 1: The distance from Town Y to Town Z is 210 miles.
This information is irrelevant. There need not even be a Town Y and a Town Z.
All we need to know is that the two people are heading in opposite directions.
What we DO need is Julie's speed
Since we cannot answer the target question with certainty, statement 1 is NOT SUFFICIENT
Statement 2: Sam average speed is 12% slower than Julie's
In other words, Sam's speed is 88% that of Julie's speed
Sam's speed is 50 miles per hour, so we can write: 50 = 88% of Julie's speed
IMPORTANT: We COULD use this information to calculate Julie's speed. Once we know each person's speed, we can determine how long it will take for the GAP to increase to 90 miles, which means we COULD answer the target question with certainty. Of course, we won't actually perform all of those tedious calculations, since we need only determine whether we have enough information to answer the target question.
So, statement 2 is SUFFICIENT
Answer:
