Answer:
I believe the answer would be: block #3 would weather fastest.
Step-by-step explanation:
If you have an ice block the size of block #1 and an ice block the size of an ice cube, and you put them each in the sun for the same amount of time, the smaller ice cube would melt first, because it has a smaller mass.
The same would happy for an ice block the size of block #1 vs 23 ice cubes. the 23 ice cubes would melt faster
I could be totally wrong, but that sounds like it makes sense, right?
Hope this helps! Happy holidays!