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A river flows due south at 100 ft/min. A motorboat that travels 450 ft./min. in still water is headed due east across the river. Find the resultant speed of the boat. round to the nearest ft./min.
We can imagine the speed of the river (due south) and the speed of the boat(due east) as two vectors working at a single point with an angle of 90 degree . This allows us to use the parallelogram law to determine the resultant speed Of the boat.
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