If a man is able to row at 5m/s in still water and he points his boat at a 50 degree angle from the shore in an upstream direction in a river that's flowing at 4 m/s how far, either up or downstream will be land on the other side of the river if the river is 45n across?

Answer 1

It's 4

Answer 2

Vb = 5m/s[90o+50o] + 4m/s.
Vb =(5*Cos140+4) + (5*sin140)i,
Vb = 0.170 + 3.21i = 3.214/m/s[87o].

Tan(90-87) = d/45.
Tan3 = d/45, d = ?.