Q 1422556431.     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

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 necessary to answer

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