Aptitude - Problems on Trains - Discussion
Discussion Forum : Problems on Trains - Data Sufficiency 1 (Q.No. 3)
Directions to Solve
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. |
Answer: Option
Explanation:
Time taken by train to cross a man = | Length of train | ![]() |
l | ....(i) |
Speed of train | 9 |
Time taken by train to cross a platform = |
(Length of train + Length of platform) |
![]() |
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.
The correct answer is (E).
Discussion:
16 comments Page 2 of 2.
Hernando said:
10 years ago
Answer should be D. No reason to assume the same speed of the train in both cases.
(1)
Nithyasri said:
1 decade ago
It's possible? I can't get it. Anyone else explain it.
(1)
Andy said:
6 years ago
x/9 = x+240/24.
24x = 9x + 2160.
15x = 2160.
x = 144.
24x = 9x + 2160.
15x = 2160.
x = 144.
(4)
Anty said:
6 years ago
x/9 = x+240/24.
24x = 9x + 2160.
15x = 2160.
x = 144.
24x = 9x + 2160.
15x = 2160.
x = 144.
(4)
Yogitha said:
1 decade ago
Please give some instruction about train problems?
Nadeem said:
8 years ago
How 1st statement is true? Explain.
(1)
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