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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.
(Provided By a Student and Checked/Corrected by EXXAMM.com Team)