Explanation:
The volume of a rectangular box is given by the formula:
Volume = length x breadth x height
In this case, the length is a, the breadth is 2b, and the height is 3c. So, the volume can be calculated as:
Volume = a x 2b x 3c
= 6abc
Therefore, the volume of the rectangular box with a, 2b and 3c as length, breadth and height respectively is 6abc.