It is 40,000mm
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20cmx 20cm x20cm
55cm x 40cm x 20cm = 21.65 inches x 15.75 inches x 7.87 inches.
55cm x 40cm x 20cm = 21.65inches x 15.75inches x 7.87inches1 inch = 2.54cm55cm = 55cm * 1 inch/2.54cm =21.65 inches40cm = 40cm*1 inch/2.54cm=15.75inches20cm = 20cm*1 inch/2.54cm=7.87inches
volume = length x width x height = 20x30x20 = 12000 cubic cm
25 mm = 2.5 cm therefore 20 cm is bigger, obviously