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Q1:
What is the speed of the train whose length is 210 metres?
I.  The train crosses another train (Howrah Express/12869) of 300 metres length running in opposite direction in 10 seconds.
 II.  The train crosses another train (Howrah Express/12869) running in the same direction at the speed of 60 km/hr in 30 seconds.

A Both I and II are necessary to answer

B Either I or II alone sufficient to answer

C II alone sufficient while I alone not sufficient to answe

D I alone sufficient while II alone not sufficient to answer

E Both I and II are not sufficient to answer