Bill Is Riding a Flatbed Railroad Car Travelling Down the Tracks

Multiple Choice

Bill is riding a flatbed railroad car travelling down the tracks at 16 m/s.The instant he passes Ted on the side of the train tracks,he throws a water balloon at him.At what angle relative to the train's direction of motion must Bill throw the balloon in order to hit Ted squarely in the face,assuming he can throw an object with a speed of 24 m/s?

A) 42 ^$\circ$
B) 48 ^$\circ$
C) 90 ^$\circ$
D) 132 ^$\circ$
E) 138 ^$\circ$