Question 544358
Fill the 3-cup container and empty it into the (empty) 5-cup container.
The 5-cup container now holds 3 cups.
Fill the 3-cup container again and pour enough from the 3-cup container into the 5-cup container to exactly fill the 5-cup container.
You will have poured 2 cups from the full 3-cup container to leave exactly 1 cup.