Verified Answer :

Even though it's 2 cubic feet, it doesn't matter. It still can be transformed into inches. 

1 foot = 12 inches

Multiply the 2 feet by 12 which should be:
12×2=24

So 24 cubic inches can be fit into a empty box with a volume of 2 cubic feet.
Hope this helps!

mathgirl22

1 feet= 12 inches
2 feet= 12 times 2 = 24 inches

24 inch cube can fit into an empty box with the volume of 2 cubic feet