A river has a steday speed of 0.345 m/s. A studen swims upstream a distance of 0.543 km and returns (Still swimming)to the starting point.
If the studen can swim at a speed of 1.12m/s in still water, how long does the trip take. Answer in units of s.
Any suggestions on this one. I can't find an example in my book to help me out.