1 square kilometre = 100 hectares (ha)
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300 000 square kilometre = 300 000 * 100 = 30 000 000 hectares
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A hectar is a unit of area, a kilometer is a unit of length, so you can't convert that. A square kilometer has 100 hectars.
10,000 square meters (m2) = 1 hectare (ha) 1,809 m2 = 0.1809 ha
10,000 square meters
To convert seconds to hours simply divide the number of seconds by 3600.
1 ha = 10 000 square metres so 2 ha = 20 000 sq m