Three cubes whose sides are in the ratio 3 : 4 : 5 were melted and a single cube, whose diagonal is $$24\sqrt3$$ cm was made. Then, the sides of the original cubes are; (in cms)

A

12, 16, 20

B

9, 12, 15

C

13.5, 18.0, 22.5

D

15, 20, 25