A 0.20-km wide river has a uniform flow speed of 4.0 m/s toward the east.It takes 20 s for a boat to cross the river to a point directly north of its departure point on the south bank.In what direction must the boat be pointed in order to accomplish this?
A)23$\degree$ west of north
B)20$\degree$west of north
C)24$\degree$ west of north
D)22$\degree$ west of north
E)17$\degree$ west of north

Question

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The Answer of A 0.20-km wide river has a uniform flow speed of 4.0 m/s toward the east.It takes 20 s for a boat to cross the river to a point directly north of its departure point on the south bank.In what direction must the boat be pointed in order to accomplish this?
A)23$\degree$ west of north
B)20$\degree$west of north
C)24$\degree$ west of north
D)22$\degree$ west of north
E)17$\degree$ west of north

A 020-Km Wide River Has a Uniform Flow Speed of 4