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Sorry chetan2u, Why cannot be L= 10 W= 20 H = 90?
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nijat00, you can find many official questions now that have same answer. So, always check for that possibility.
Felipe54321, We are given \(L\geq W\geq H\), so L as 10 will not fit in.­
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chetan2u - how did you so quickly know that W cannot be 20 ?
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­Again a pretty straight forward questions.

What is important is:-
LWH = 18000
one of the dimension is 20, so the other two would be 18000/20 or 900.

Look for a pair of options whose product is 900. But keep in mind that the values can be same.
Only possibility is 30*30
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If one of them is 20, the second would be 900/20 or 45. But 45 is not an option.
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chetan2u - how did you so quickly know that W cannot be 20 ?

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