A swimmer heading directly across a river 200 m wide reaches

Last updated: 7/30/2022

A swimmer heading directly across a river 200 m wide reaches the opposite bank in 1 min 40 s. She is swept downstream 480 m. How fast can she swim in still water? 1.2 m/s 1.4 m/s 0.50 m/s 2.0 m/s 0.80 m/s