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What is the speed of the train 'A'? I. Train A crosses 200-metre-long train B running in opposite direction in 20 seconds. II. Speed of the train B is 60 Km/h. III. Length of train A is twice that of train B.

I and II only
II and III only
I and III only
All, I II and III

Correct Answer: All, I II and III

Explanation:

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