Question 1153942
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h*(h+3)*((h+3)+5) = 336


h*(h+3)*(h+8) = 336.     (1)


336 = 4*7*12.


It is the decomposition of the number 336 into the product of 3 factors with the same differences 
between the factors as in the formula (1).


Therfore,  x= 4 is the solution for x.


<U>ANSWER</U>.  Height is 4 inches; width is 4+3 = 7 inches;  length is 4+8 = 12 inches.
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Solved.