A river has a steady speed of 0.350 m/s. A student swims upstream a distance of 1.00 km and swims back to the starting point.
If the student can swim at a speed of 1.50 m/s in still water, how long does the trip take (swimming up and down in the current)?
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If the water were still, by how much would the trip be longer or shorter? (Give a negative answer for a shorter trip.)
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