Answer:
5 meters
Explanation:
If we want to get the volume of the first rectangular prism, it would be 6x10x2=120
So the second one must have the same volume of the second one, so for the second one, we have to 4x6x?=120
So if you want to get the "?" you have have to divide the 120 by 6 then 4, so the answer will be 5.
And if you are not sure if it's right then multiply 6,4 and 5 together and you will get 120.