10 mm = 1 cm
100 cm = 1 m
1000 m = 1 km
So 1 x 1000 x 100 x 10 = 1000000 mm.
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8490 mm = 0.00849 km
By unit of length and distance and conversion ,we can say that 1 km=1000000 mm 20000 mm=0.02 km
The conversion between km and mm are given .On finding the relation we get as follows . 1 km=1000000 mm .
1000 mm = 1 m = 0.001 km
1.8 km = 1800000.00 mm