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Q1:
What is the speed of the boat in still water?
I.  The boat covers a distance of 48 kms in 6 hours while running upstream.
 II.  The boat covers the same distance in 4 hours while running downstream.

A I alone sufficient while II alone not sufficient to answer

B II alone sufficient while I alone not sufficient to answer

C Both I and II are necessary to answer

D Either I or II alone sufficient to answer

E Both I and II are not sufficient to answer