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Q1: What is the speed of the boat in still water?  I. It takes 2 hours to cover the distance between A and B downstream.  II. It takes 4 hours to cover the distance between A and B upstream.

A Both I and II are necessary to answer

B II alone sufficient while I alone not sufficient to answer

C I alone sufficient while II alone not sufficient to answer

D II alone sufficient while I alone not sufficient to answer

E Both I and II are not sufficient to answer