A river has a steady speed of 0.5m/s. a student swims upstream a distance of 1.00km and swim back to the starting point .a] if the can swim at speed of 1.20m/s in still water , how long does the trip take? b] how much time is required in still water for the same length swim?. c] intuitively, why does the swim take longer when there is a current?



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