A swimmer, capable of swimming at a speed of 1.5 m/s in still water (i.e., the swimmer can swim with a speed of 1.5 m/s relative to the water), starts to swim directly across a 3.3 km wide river. However, the current is 0.91 m/s, and it carries the swimmer downstream.
how long to cross the river?
how far downstream when reaching the other side?
how long to cross the river?
how far downstream when reaching the other side?