It is 10/1000. This can be simplified but simplification means that you lose information about the precision of the fraction.
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Convert to the same units, then the fraction can be simplified. The kilo- prefix means 1000 → 1 km = 1,000 m → 100m/1km = 100m/1000m = 1/10
0.1 km is 1/10 as a fraction
100 m is a tenth of a kilometre.
850 m / 1 km = 850 m / 1000 m = 850/1000 = 17/20
0.35 or 7/20