A Swimmer Heading Directly Across a River That Is 200

A swimmer heading directly across a river that is 200 m wide reaches the opposite bank in 6 min 40 s. During this swim, she is swept downstream 480 m. How fast can she swim in still water?

A) 1.8 m/s
B) 0.50 m/s
C) 1.2 m/s
D) 0.80 m/s
E) 1.4 m/s