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**1. Homework Statement**

A ferry boat headed directly away from the river bank is traveling at 3 km/h with respect to the water in a river flowing at 4 km/h. A passenger walks diagonally toward the stern of the boat with a speed of 1.39 m/s. The passenger's path is at an angle of 53.1 degrees toward the upstream direction from the length of the boat. What is the passenger's speed relative to the bank?

**2. Homework Equations**

v'=(u+v)/(1+(u*v)/c^2)

**3. The Attempt at a Solution**

I know the speeds form a triangle with leg lengths 3 and 4 and hypotenuse 5. I'm not sure where to go from there, though....