Exam GMAT Section 2 topic 1 question 635 discussion

Actual exam question from Test Prep's GMAT Section 2

Question #: 635
Topic #: 1

There are three sprinters on a racetrack. How much time will it take all three to finish an 800 meters race?
(1) The first runner can run the fastest, he runs at a 110% of the slowest runner.
(2) The slowest runner runs at a constant speed of 7 meters per second.

A. Statement (1) BY ITSELF is sufficient to answer the question, but statement (2) by itself is not.
B. Statement (2) BY ITSELF is sufficient to answer the question, but statement (1) by itself is not.
C. Statements (1) and (2) TAKEN TOGETHER are sufficient to answer the question, even though NEITHER statement BY ITSELF is sufficient.
D. Either statement BY ITSELF is sufficient to answer the question.
E. Statements (1) and (2) TAKEN TOGETHER are NOT sufficient to answer the question, requiring more data pertaining to the problem. C

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Suggested Answer: Explanation 🗳️
The trick to this question is to understand that the time it would take them all to finish the track is the time it would take the slowest sprinter to finish the track.
Statement (1) tells us that the first sprinter is the fastest among the three.
Statement (2) tells us that the third sprinter runs the slowest and therefore they determine the time it would take all of them to finish the track. The rate of the slowest sprinter is given and so this answer is solvable.

by 18a4777 at June 2, 2025, 10:19 a.m.

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18a4777

1 week, 6 days ago

Selected Answer: B

sufficient info

upvoted 1 times

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