Answer :
Given : Volume of rectangular prism = 250 cm3
And
That rectangular prism divided into two cubes of equal volume.
So,
2 ( Volume of cube ) = Volume of prism
And we know
Volume of cube = ( Side )3
So,
2 ( Side )3 = 250
( Side )3 = 125
( Side )3 = 53
Side = 5 cm ( Ans )