Events & Promotions
| Last visit was: 20 Sep 2026, 19:12 |
It is currently 20 Sep 2026, 19:12 |
|
|
GMAT Club Daily Prep
Thank you for using the timer - this advanced tool can estimate your performance and suggest more practice questions. We have subscribed you to Daily Prep Questions via email.
Customized
for You
Track
Your Progress
Practice
Pays
Not interested in getting valuable practice questions and articles delivered to your email? No problem, unsubscribe here.
Sep 2107:00 PM EDT
-10:00 PM EDT
Boost your GMAT score in less than one month in a live online class + 6 months access to TTP OnDemand video courses included!
Sep 1810:00 AM IST
-11:00 PM IST
Start your journey with a fully customized action plan and work with a dedicated mentor to achieve a 735+ score.
Sep 2601:00 PM EDT
-04:00 PM EDT
Top scores are possible when you enroll in a powerful GMAT course, taught live online + 6 months access to TTP OnDemand video courses included. Class starts Saturdays Sept. 26, 2026 - Dec. 19, 2026, 1:00pm-4:00pm ES
11 Jul 2024, 07:00
Kudos
Bookmarks
D
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
55%
(hard)
Question Stats:
67% (01:51) correct
33%
(01:52)
wrong
based on 569
sessions
History
Date
Time
Result
Not Attempted Yet
What is the length of a train traveling at a constant speed of 90 meters per second, if it crosses Bridge A in 10 seconds, from the moment it enters the bridge to the moment its last carriage exits the bridge?
(1) The length of Bridge A is five times the length of the train.
(2) During the journey, the train crosses Bridge B, which is four times the length of Bridge A, in 35 seconds.
A. Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient to answer the question asked.
B. Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient to answer the question asked.
C. BOTH statements (1) and (2) TOGETHER are sufficient to answer the question asked, but NEITHER statement ALONE is sufficient to answer the question asked.
D. EACH statement ALONE is sufficient to answer the question asked.
E. Statements (1) and (2) TOGETHER are NOT sufficient to answer the question asked, and additional data specific to the problem are needed.
(A) Statement 1 alone is sufficient, but statement 2 alone is not.
(B) Statement 2 alone is sufficient, but statement 1 alone is not.
(C) Both statements together are sufficient, but neither alone is sufficient.
(D) Each statement alone is sufficient.
(E) Neither statement is sufficient, even when combined.
(1) The length of Bridge A is five times the length of the train.
(2) During the journey, the train crosses Bridge B, which is four times the length of Bridge A, in 35 seconds.
A. Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient to answer the question asked.
B. Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient to answer the question asked.
C. BOTH statements (1) and (2) TOGETHER are sufficient to answer the question asked, but NEITHER statement ALONE is sufficient to answer the question asked.
D. EACH statement ALONE is sufficient to answer the question asked.
E. Statements (1) and (2) TOGETHER are NOT sufficient to answer the question asked, and additional data specific to the problem are needed.
|
(A) Statement 1 alone is sufficient, but statement 2 alone is not.
(B) Statement 2 alone is sufficient, but statement 1 alone is not.
(C) Both statements together are sufficient, but neither alone is sufficient.
(D) Each statement alone is sufficient.
(E) Neither statement is sufficient, even when combined.
11 Jul 2024, 08:45
Kudos
Bookmarks
What is the length of a train traveling at a constant speed of 90 meters per second, if it crosses Bridge A in 10 seconds, from the moment it enters the bridge to the moment its last carriage exits the bridge?
Assuming the length of the bridge is b meters and the length of the train is t meters, the stem implies that (total distance)/(speed) = (b + t)/90 = 10, which simplifies to b + t = 900. We need to find the length of the train, t.
(1) The length of Bridge A is five times the length of the train.
This implies that b = 5t. Together with b + t = 900, this gives a system of two distinct linear equations with two unknowns, which means we can solve for both unknowns and thus answer the question. Sufficient.
(2) During the journey, the train crosses Bridge B, which is four times the length of Bridge A, in 35 seconds.
This implies (4b + t)/90 = 35, which gives 4b + t = 35 * 90. Again, we have a system of two distinct linear equations with two unknowns, which means we can solve for both unknowns and thus answer the question. Sufficient.
Answer: D.
GMAT Club Official Explanation:
What is the length of a train traveling at a constant speed of 90 meters per second, if it crosses Bridge A in 10 seconds, from the moment it enters the bridge to the moment its last carriage exits the bridge?
Assuming the length of the bridge is b meters and the length of the train is t meters, the stem implies that (total distance)/(speed) = (b + t)/90 = 10, which simplifies to b + t = 900. We need to find the length of the train, t.
(1) The length of Bridge A is five times the length of the train.
This implies that b = 5t. Together with b + t = 900, this gives a system of two distinct linear equations with two unknowns, which means we can solve for both unknowns and thus answer the question. Sufficient.
(2) During the journey, the train crosses Bridge B, which is four times the length of Bridge A, in 35 seconds.
This implies (4b + t)/90 = 35, which gives 4b + t = 35 * 90. Again, we have a system of two distinct linear equations with two unknowns, which means we can solve for both unknowns and thus answer the question. Sufficient.
Answer: D.
General Discussion
11 Jul 2024, 07:29
Kudos
Bookmarks
Bunuel
Given figures in question:
Speed of train = s = 90 m/s
Time taken to cross bridge = 10 sec
we need to find L(T)- Length of the train
1) we will use simple concept of speed = distance / time but note here since train is crossing the bridge so total distance would be d= L(T) + L(Bridge A)
L(Bridge A) = 5 * L(T)
so formula becomes: 90= L(Bridge A) + L(T)/ 10 --> substituing L(Bridge A) = 5 * L(T)
we get 90 = 6 L(T)/10
hence L(T)= 150 m
Sufficient
2)now train crosses bridge B instead of A
L(Bridge B) = 4 * L(Bridge A) in t= 35 sec
hence, eqn becomes 90= L(T) + L(Bridge B) /35 ----> 90*35= L(T)+ 4 L(A)
we also know that 90= L(Bridge A) + L(T)/ 10 ----given in original question
hence solving both these eqn, we get L(T)= 150 m
Sufficient
hence Option D is correct
Emkicheru
Joined: 12 Sep 2023
Last visit: 12 Sep 2025
Posts: 119
Own Kudos:
Given Kudos: 11
Location: Kenya
Schools: Anderson (UCLA) Sloan (MIT) Columbia '27
GMAT 1: 780 Q50 V48
GRE 1: Q167 V164
GPA: 3.7
Schools: Anderson (UCLA) Sloan (MIT) Columbia '27
GMAT 1: 780 Q50 V48
GRE 1: Q167 V164
Posts: 119
Kudos:
22
11 Jul 2024, 07:35
Kudos
Bookmarks
The statements are sufficient ie 10secs us almost equivalent to four times 35 secs. Implies length of bridge B is four times length of bridge A.
Posted from my mobile device
Posted from my mobile device
