Math Pblm on trains-Data Sufficiency

What is the speed of the train whose length is 210 metres?

I. The train crosses another train (Prasanthi Express/12869) of 300 metres length running in opposite direction in 10 seconds.
II. The train crosses another train (Prasanthi Express/12869) running in the same direction at the speed of 60 km/hr in 30 seconds.


A.  I alone sufficient while II alone not sufficient to answer
B.  II alone sufficient while I alone not sufficient to answer
C.  Either I or II alone sufficient to answer
D.  Both I and II are not sufficient to answer
E.  Both I and II are necessary to answer

Watch this space for answer in a week.