So apparently Arthur paints at a constant rate. He is an animal. He doesn't stop to dip his paintbrush.
He just paints.
However, he is still beat by four armed Cheyenne who can paint at double the rate.
In one hour, Arthur can paint 1/xth of a wall.
Arthur isn't just slow at painting, but he is also bad at color wall choices. Algebraically, 1/3 if the shit color was his idea.
But since Arthur and Cheyenne couldn't agree on a color they decided to paint the wall in non respecting color stripes of various sizes.
Clarke's boy Bee Hughes told the fam they would go to math jail if they used extraneous solutions as solutions. Suffice to say, they all went to math jail. It was cold there. Full of literature.