Compute all parts of given question:

Question: In moving a 45.0kg desk from one side of a classroom to the other, a professor finds that a horizontal force of 295N is necessary to set the desk in motion, and a force of 225N is necessary to keep it in motion at a constant speed.

Part A: What is the coefficient of static friction between the desk and the floor?

Part B: What is the coefficient of kinetic friction between the desk and the floor?

I need help to find the coefficient of kinetic friction between the desk and the floor.