A swimmer is able to swim at a speed of 0.90 m/s in still water. (a) How long does it ta...

A swimmer is able to swim at a speed of 0.90 m/s in still water. (a) How long does it take the swimmer to go a distance of 1500 m in still water? Call this time (b) The swimmer then decides to swim the same distance in a river having a current with a speed of 0.50 m/s. How long does this take if she swims with the current? Call this time (c) How long does it take her to swim the same distance against the current? Call this time (d) Explain why is not equal to