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# Aptitude - Problems on Trains - Discussion

@ : Home > Aptitude > Problems on Trains > Data Sufficiency 1 - Discussion

"Actions speak louder than words."
- (Proverb)

Each of the questions given below consists of a statement and / or a question and two statements numbered I and II given below it. You have to decide whether the data provided in the statement(s) is / are sufficient to answer the given question. Read the both statements and

• Give answer (A) if the data in Statement I alone are sufficient to answer the question, while the data in Statement II alone are not sufficient to answer the question.
• Give answer (B) if the data in Statement II alone are sufficient to answer the question, while the data in Statement I alone are not sufficient to answer the question.
• Give answer (C) if the data either in Statement I or in Statement II alone are sufficient to answer the question.
• Give answer (D) if the data even in both Statements I and II together are not sufficient to answer the question.
• Give answer(E) if the data in both Statements I and II together are necessary to answer the question.

3.

 What is the length of a running train? I. The train crosses a man in 9 seconds. II. The train crosses a 240 metre long platform in 24 seconds.

 [A]. I alone sufficient while II alone not sufficient to answer [B]. II alone sufficient while I alone not sufficient to answer [C]. Either I or II alone sufficient to answer [D]. Both I and II are not sufficient to answer [E]. Both I and II are necessary to answer

Explanation:

 Time taken by train to cross a man = Length of train Speed = l ....(i) Speed of train 9

 Time taken by train to cross a platform = (Length of train + Length of platform) Speed = l + 240 ....(ii) Speed of train 24

 From (i) and (ii), we get l = l + 240 . 9 24

Thus, l can be obtained. So both I and II are necessary to get the answer.