Velocity

A woman who can row a boat at 6.4 km/h in still water faces a long, straight river with a width of 6.4 km and a current of 3 .2 km/h. Let  width= point directly across the river and j point directly downstream. If she rows in a straight line to a point directly opposite her starting position, (a) at what angle to  width= must she point the boat and (b) how long will she take? (c) How long will she take if, instead, she rows 3.2km down the river and then back to her starting point? (d) How long if she rows 3.2km up the river and then back to her starting point? (e) At what angle to  width= should she point the boat if she wants to cross the river in the shortest possible time? (f) How long is that shortest time?

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