A builder takes 8 days to dig a hole that is 8 meters long, 8 meters wide and 8 meters deep. How many days will it take him to dig a hole that is 4 meters long, 4 meters wide and 4 meters deep?

Answer 1

Hole #1 is 8*8*8 or8^3=512cu/m. 512/8=64cu/m/day.

Hole #2 is 4^3=64cu/m. So #2 takes 1 day.