A woman who can row a boat at 7.3 km/h in still water faces along, straight river with a width of 6.8 km and a current of 3.3km/h. Let point directly across the river and point directly downstream. If she rows in a straight lineto a point directly opposite her starting position,(a) at what angle to must she point the boat and (b) how long(in hours) will she take? (c) How long (in hours)will she take if, instead, she rows 3.8 km down the riverand then back to her starting point? (d) How long(in hours) if she rows 3.8 km up the river and then back to her starting point? (e) At what angle to should she point the boat if she wants to cross the riverin the shortest possible time? (f) How long (inhours) is that shortest time?