Question

What is the time taken by train to go from Station A to Station B? Statement I:  If the train increases its speed by 20%, then it reaches 40 minutes earlier. Statement II:  If the train decreases its speed by 40%, then it reaches 90 minutes late.

In each of the following questions, a question is followed by two or three statement. Read all the statements and find that which statements are required to answer the question and answer accordingly. 
A If the data in statement I alone is sufficient to answer the question.
B If the data in statement II alone is 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 given in both I and II together are not sufficient to answer the question.
E If the data in both the statements I and II together are necessary to answer the question.
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