Physics building problem?

In the annual battle of the dorms, students gather on the roofs of Jackson and Walton dorms to launch water balloons at each other with slingshots. The horizontal distance between the buildings is 37.0 m, and the heights of the Jackson and Walton buildings are, correspondingly, 16.0 m and 23.0 m. The first balloon launched y the Jackson team hits Walton dorm 2.00 s after launch, striking it halfway between the ground and the roof. Ignore air resistance. (a) Find the direction of the balloon’s initial velocity. Give your answer as an angle (in degrees) measured above the horizontal. (b) A second balloon launched at the same angle hits the edge of Walton’s roof. Find the initial speed of this second balloon.

Link to image of problem:

http://img190.imageshack.us/img190/5630/eat12246108825390328772.gif