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

I alone sufficient while II alone not sufficient to answer
 
II alone sufficient while I alone not sufficient to answer
 
Either I or II alone sufficient to answer
 
Both I and II are not sufficient to answer
 
Both I and II are necessary to answer
 

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