2 km = 20,000 dm
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10 dm = 1 m so 200 dm = 20m. 20 km is 1000 times as long. This is assuming "dm" = decimetres. If it = dekametres then 200 would be 2 km.
2000 meters.
1 dm2 = (1 m / 10 dm)2 = 1/100 m2 or 0.01 m2
1.67 miles.
If the question means how many miles is 600 km, the answer is 372.82 (to 2 dp).