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Question

A train crosses another train running in the opposite direction in 25 seconds. What is the speed of the train?
I. Both the trains are running at the same speed.
II. The first train is X cm long.

In each of the following questions, a question and two statements I and II are given. You have to decide whether the date given in the statements are sufficient to answer the question or not.
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.
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.
C If the data either in statement I alone or statement II alone are sufficient to answer the question.
D If the data in both statement I and II together are not sufficient to answer the question.
E If the data in both statement I and II together are necessary to answer the question.
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