On Monday, Max collected 1/4 of a bin of paper.
On Tuesday, Max collected 2/4 of a bin of paper.
So in total, Max collected 1/4 + 2/4 = 3/4 of a bin of paper.
Rick collected 6 times as much as Max, which means Rick collected 6 * (3/4) = 18/4 = 4.5 bins of paper.
Therefore, Rick collected 4.5 bins of paper.