Okay, I have a test in a few days and I feel like I'm getting stuck on easy questions but I never did get a proper example shown to me so I'm not quite there yet.

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A boat heads across a river at a rate of 4 miles per hour. If the current is flowing east at a rate of 3 miles per hour, find the resultant velocity of the boat. Also find the projection of v onto u.

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Now I understand c^2 = a^2 + b^2

= 3^2 + 4^2

c = 5

5 miles per hour. I get that. How do I do the projection of v onto u?

projec u V = ( (u)(v) / U^2 ) (u)

u = ?

v = ? How do I get them when there is a 0 involved?

The text says the answer is 5 m/h at an angle of 53.13 degrees to the bank.

How?