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All you need to to is remember 1Km = 1000m and 1m = 1000mm

so mm expressed as meters is 50 divided by 1000 = 0.05m

and 0.05m in Km we have to devide by 1000 again so that's = 0.00005Km

so 50mm = 0.00005Km

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13y ago

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