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Convert them all into the same unit, for this case let's say cm.

20cm = 20cm

20 inches = 50.8cm

200mm = 20cm

When you type 02m, do you mean 2m or 0.2m?

0.2m = 20cm

2m = 200cm

If 0.2m, then 20 inches is the longest length.

If 2m then that is the longest length.

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14y ago
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Q: What is he longest 20 cm 20 inches 200 mm 02m?
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