A 10 m wide river is flowing south at 3m/s and you swim at an angle of 30 degrees north of directly east at 1m/s.

A 10 m wide river is flowing south at 3m/s and you swim at an angle of 30 degrees north of directly east at 1m/s. How far do you drift up or down the stream from your starting point once you reach the other side?

A. 20.9m south
B. 38.9m south
C. 28.9m south
D. 40.9m south