4. A ferry boat is moving at 10.0 m/s due Southwest with respect to the land and a cat walking on that ferry boat is moving at 5.0 m/s East with respect to the ferry boat and a flea flying amid the cat's fur is moving at 2.00 m/s North with respect to the cat. What is the speed of the flea relative to land?

What is the velocity of the flea in problem (4) relative to the boat?