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100 cm is longer
990 cm is longer because 100 cm is one meter; that is 9.9 meters
1m = 100cm 1km = 1000m So .21km = .21 * 1000 * 100 = 21000 cm
The answer is 1 km.
There are 100 cm in a metre, and 1000 metres in a km, so that would be 100*1000, which gives you 100,000 cm in a km.