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Since J sprints faster than J rows, J wants to minimize rowing time, and
thus should row directly toward the opposite shore. Since the river is 1
km wide and rowing speed in still water is 6km/hr it will take 10 minutes
to reach the opposite shore. With the current of 4 km/hr, J will be 2/3
km downstream from the supposed beloved to be. Sprinting along the shore
2/3 km at 10 km/hr will take 4 minutes. So the total time for this
approach is 14 minutes....
Richard Grandy