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15 May 2017, 02:08
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A
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:
78% (01:14) correct
22%
(01:23)
wrong
based on 1499
sessions
History
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Time
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Chan and Mieko drove separate cars along the entire length of a certain route. If Chan made the trip in 15 minutes, how many minutes did it take Mieko to make the same trip?
(1) Mieko’s average speed for the trip was 3/4 of Chan’s average speed.
(2) The route is 14 miles long.
(1) Mieko’s average speed for the trip was 3/4 of Chan’s average speed.
(2) The route is 14 miles long.
15 May 2017, 02:17
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Statement 1st- Chan's speed : Mieko's speed = 4:3 and for same distance speed is inversely proportional to time => c's time : m's time =3:4 and 3-> 15 minutes that implies 4 part represents 20 minutes and hence sufficient.
Statement 2nd is clearly insufficient -> OPTION A
Statement 2nd is clearly insufficient -> OPTION A
30 Sep 2020, 09:48
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mihir0710
Given: Chan and Mieko drove separate cars along the entire length of a certain route. Chan made the trip in 15 minutes.
Target question: how many minutes did it take Mieko to make the same trip?
Statement 1: Mieko’s average speed for the trip was 3/4 of Chan’s average speed.
If you aren't familiar with attari92's inverse proportion property, you can still solve the question.
Let d = the distance traveled
Let r = Chan's speed (in the miles per minute)
So, (3/4)r = Mieko's speed (in the miles per minute)
In other words, 3r/4 = Mieko's speed
time = distance/speed
So, from the given information, we can write: d/r = 15 (minutes)
This means Mieko's travel time = d/(3r/4)
= (d)(4/3r)
= 4d/3r
= (4/3)(d/r)
= (4/3)(15)
= 20
So, Mieko's travel time is 20 minutes
Since we can answer the target question with certainty, statement 1 is SUFFICIENT
Statement 2: The route is 14 miles long
Since this statement provides no information about Mieko, there's no way to calculate Mieko's travel time
Statement 2 is NOT SUFFICIENT
Answer: A
Cheers,
Brent
