hm is the abbreviation for hectometers.
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1 km = 10 hm
firstly its not hevckers it is hectometers . 1 km =10 hm. 10000 hm =1000 km .
1 meter=0.01 hectometers
1 centimeter=0.0001 hectometers
10 hectometres = 1 kilometre so 30 hm = 3 km. Simple!