Bunuel wrote:
Will Laurie get to the apartment building before Ernest if they both embark at the same time?
(1) Laurie will take the subway, which is twice as fast as a taxi, then she will walk 3 blocks.
(2) Ernest who is 2 times closer to the apartment building than Laurie will take a taxi to the building.
Target question: Will Laurie get to the apartment building before Ernest if they both embark at the same time? Statement 1: Laurie will take the subway, which is twice as fast as a taxi, then she will walk 3 blocks. No information about Ernest. Statement 1 is NOT SUFFICIENT
Statement 2: Ernest who is 2 times closer to the apartment building than Laurie will take a taxi to the building. No information about Laurie. Statement 2 is NOT SUFFICIENT
Statements 1 and 2 combined Since we have no information about the Laurie's walking speed or the length of the 3 blocks, there are several
conflicting scenarios that satisfy BOTH statements. Here are two:
Case a: Laurie's travel distance = 20 miles, and Ernest's travel distance = 10 miles.
The taxi's speed = 5 miles per hour, and the subway's speed = 10 miles per hour
time = distance/speed
So, Ernest's travel TIME = 10/5 = 2 hours
Laurie travels 10 miles by subway (at a speed of 10 miles per hour), and she walks the remaining 10 miles (at a speed of
1 mile per hour)
So Laurie's total travel TIME = 10/10 + 10/
1 = 11 hours
In this case, the answer to the target question is
NO, Laurie will NOT get to the apartment building before ErnestCase b: Laurie's travel distance = 20 miles, and Ernest's travel distance = 10 miles.
The taxi's speed = 5 miles per hour, and the subway's speed = 10 miles per hour
time = distance/speed
So, Ernest's travel TIME = 10/5 = 2 hours
Laurie travels 10 miles by subway (at a speed of 10 miles per hour), and she walks the remaining 10 miles (at a speed of
20 miles per hour)
So Laurie's total travel TIME = 10/10 + 10/
20 = 1.5 hours
In this case, the answer to the target question is
YES, Laurie WILL get to the apartment building before ErnestSince we cannot answer the
target question with certainty, the combined statements are NOT SUFFICIENT
Answer: E
Cheers,
Brent
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