A river has a steady speed 0.500 m/s. A student swims upstream a distance of1.00 km and swims back to the starting point. a) If the student can swim ata speed of 1.20 m/s in still water, how long does the trip take? b) How muchtime is required in still water for the same length swim? c) Intuitively, whydoes the swim take longer when there is a current?