Help on a physics problem for kinetic energy given weight and distance.?

Question

A 55 kg woman stands on the back of a 6.0 m long, 110 kg raft that is floating at rest in still water with no friction. The raft is 0.50 m from a fixed pier.

Picture to go with problem: http://i284.photobucket.com/albums/ll28/bathtub2008/8_58alt.gif

(a) The woman walks to the front of the raft and stops. How far is the raft from the pier now?

_____m

(b) While the woman walks, she maintains a constant speed of 3.0 m/s relative to the raft. Find the total kinetic energy of the system (woman plus raft)

_____J

Find the total kinetic energy of the system if the woman walked at 3.0 m/s on a raft tied to the pier. (Make a mental comparison of these two values.)

_____J