A river has a steady speed of 0.420 m/s. A student swims upstream a distance of 1.00 km and swims back to the starting point.

(a) If the student can swim at a speed of 1.25 m/s in still water, how long does the trip take?

(a) If the student can swim at a speed of 1.25 m/s in still water, how long does the trip take?