projectile

l (height)
l
(canon's velocity>) /--------------------l
(distance)
I did a mock of the picture provided. Here it is showing a cannon shooting a banana to the monkey on top of a tree. It gives you no numbers.
Question:
Derive a general equation for the time of flight of the banana en route to the monkey in terms of only the velocity, distance, and height (as labelled in the graph above).
hint: if you are doing everything right, there should be a lot of cancellations resulting in a relatively simple solution

see the wikipedia entry for trajectory for a good discussion.