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11 Sep 2025, 05:49
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BinodBhai
I think we can infer that the speeds are the same, but the truth is that this question is poorly written.
It should be a medium- to hard-level question that involves seeing that you can use the information about train B to determine the length of the bridge and then use the other information to determine the length of A. Instead, because of minor detail, it can be argued that it's unclear what's going on with the speed of train A.
So, your best move is not to worry too much about this correct answer to this question.
What we can learn from this question is how to use relationships between speeds and distance to calculate other distances. We can also see that it's important to consider whether we've been told that something is traveling at a constant rate. At the same time, hopefully, any question involving such concepts that we see on the test will be better written than this one.
Here's a better constructed example of a DS question in which noticing that a rate may not have been constant is key.
https://gmatclub.com/forum/stations-x-a ... 77177.html
14 Sep 2025, 04:44
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You select what seems correct to you based on your reasoning. As I said, I will select (C) here and move on. Do not takeaway that (E) could be the right answer in such a case on GMAT. This question does not adhere to the typical logic used by GMAT questions.
Aashimabhatia
14 Sep 2025, 04:47
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The pole needn't be on the bridge. It could be anywhere on the journey of the train.
But yes, we can assume that the train is traveling at a constant speed in the context mentioned (so 'while crossing the bridge' and 'while crossing the pole')
But yes, we can assume that the train is traveling at a constant speed in the context mentioned (so 'while crossing the bridge' and 'while crossing the pole')
BinodBhai
