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Q1:
A boat takes a total time of three hours to travel downstream from P and Q and upstream back from Q to P. What is the speed of the boat in still water?
I.  The speed of the river current is 1 km per hour.
 II.  The distance between P and Q is 4 km.

A Both I and II are necessary to answer

B Both I and II are not sufficient to answer

C Either I or II alone sufficient to answer

D I alone sufficient while II alone not sufficient to answer

E II alone sufficient while I alone not sufficient to answer