The given question consists of two statements numbered I and II. You must decide whether the data provided in the statements are sufficient to answer the question:
What is the speed of train A?
Statement I. The train A crosses another train B running in the opposite direction in 15 seconds.
Statement II. The train A crosses a man standing on a platform in 6 seconds.
1.If the data in both statements I and II together are necessary to answer the question.
2.If the data in statement I alone is sufficient to answer the question, while the data in statement II alone is not sufficient to answer the question.
3.If the data given in both statements I and II together are not sufficient to answer the question.
4.If the data in statement II alone is sufficient to answer the question, while the data in statement I alone is not sufficient to answer the question.
5.If the data either in statement I alone or in statement II alone is sufficient to answer the question.
Correct Answer : 3
Solution :
Let length and speed of train A is LAm and SA m/s respectively
From I:
Let length and speed of train B is LBm and SB m/s respectively
(LA + LB)/(SA + SB) = 15
But from these data we cannot find the answer.
From II:
LA/SA = 6
But from these data we cannot find the answer.
From I and II:
After combining both statements, we could not find the answer.
Hence, statement I and II together are not sufficient to answer the question.
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