Use the 3 quart pitcher to fill the 5 quart pitcher twice.
The second time you pour the 3 quart pitcher into the 5 quart pitcher, you will only be able to pour 2 quarts out, because then the 5 quart pitcher will be full.
Since you will be pouring 2 quarts out of the 3 quart pitcher, there will be 1 quart left in the 3 quart pitcher.
I'm not sure if I explained that in a way that makes sense, if I didn't just PM me or leave a comment or something and I'll try to explain better.
Hope this helps!!
