It is: 400/1000 or 2/5 in its lowest terms
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There are 400 metres in two-fifths of a kilometre.
200 metres is 1/5 of a kilometre.
There are 1000 metres in 1 kilometre
There are 1000 metres in one kilometre so there must be 500 metres in half a kilometre.
1 kilometre = 1000 metres.