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Updated on: 26 Nov 2023, 06:12
Originally posted by pablovaldesvega on 26 Nov 2023, 06:03.
Last edited by gmatophobia on 26 Nov 2023, 06:12, edited 1 time in total.
Last edited by gmatophobia on 26 Nov 2023, 06:12, edited 1 time in total.
Formatted the question
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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:
65%
(hard)
Question Stats:
64% (01:40) correct
36%
(01:37)
wrong
based on 1198
sessions
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Time
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In the same period of time that a sports car traveled 120 miles, a truck traveled 100 miles. What was the truck's average speed during this period of time?
(1) During the first 30 minutes, the sports car traveled 30 miles.
(2) The truck's average speed was 10 miles per hour less than the sports car's.
(1) During the first 30 minutes, the sports car traveled 30 miles.
(2) The truck's average speed was 10 miles per hour less than the sports car's.
A – (1) ALONE is sufficient, but (2) alone is not sufficient.
B – (2) ALONE is sufficient, but (1) alone is not sufficient.
C – TOGETHER are sufficient, but NEITHER ALONE is sufficient.
D – EACH ALONE is sufficient.
E – NEITHER ALONE NOR TOGETHER is the statements sufficient.
B – (2) ALONE is sufficient, but (1) alone is not sufficient.
C – TOGETHER are sufficient, but NEITHER ALONE is sufficient.
D – EACH ALONE is sufficient.
E – NEITHER ALONE NOR TOGETHER is the statements sufficient.
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26 Nov 2023, 06:21
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pablovaldesvega
Given:
In the same period of time that a sports car traveled 120 miles, a truck traveled 100 miles.
- Average speed of the sport's car = \(s_1\)
- Average speed of the truck = \(s_2\)
\(\frac{120}{s_1} = \frac{100}{s_2}\)
Inference: As we know the ratio of \(s_1\) and \(s_2\), knowing one value we can find the value of the other. Alternatively, if we can find the relationship between \(s_1\) and \(s_2\), we can find the values.
Statement 1
(1) During the first 30 minutes, the sports car traveled 30 miles.
With the given information we can only find the average speed of the car in the first 30 minutes. We don't know if the travel time was only 30 minutes or was more than that. Hence, we don't have sufficient information to find the average speed of the sports car for the entire journey.
The statement alone is not sufficient and we can eliminate A and D.
Statement 2
(2) The truck's average speed was 10 miles per hour less than the sports car's.
\(s_2 = s_1 - 10\)
This statement is sufficient as it presents a relationship between the average speed of the truck and the average speed of the car.
\(\frac{120}{s_1} = \frac{100}{s_1 - 10}\)
Solving further \(s_1\) = 60, and \(s_2\) = 50.
Option B
General Discussion
Engineer1
Joined: 01 Jan 2014
Last visit: 23 Jan 2026
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Concentration: Strategy, Finance
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26 Jan 2024, 09:00
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This does not look like a 700+ question. Probably it is 600-650 level. Since I saw the level before solving, I doubted that the answer will be comparatively this simple. I personally take >3 / 3.5 mins to solve a 700+ question. Can an expert please revisit the difficulty tag chetan2u gmatphobia? Thanks!
