A river flows north with a velocity of 8.0 m/s. A man is swimming east at a velocity of 3 m/s. How long will it take for him to cross the 150m river? Relative to the far side of the river, what is the man's velocity as he crosses the river? If the man entered the river going east, how far downstream will the current take him? At what angle should he enter the river to reach it directly east of where he first entered?