A child walks due east on the deck of a ship at 1 miles per hour. The ship is moving north at a speed of 9 miles per hour.
Find the speed and direction of the child relative to the surface of the water.
Speed = __ mph
The angle of the direction from the north = ___ (radians)
The last time I solved a problem like this was last summer, it looks like a "Related Rates" problem; so, I just need a refresher if anyone could care to help. Thank you very much.