It is 0.004 km.
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It is 400 km.
No because 4000 m equals 4 km which is less than 40 km
To convert mm to km, divide by one million. 45000 mm = 0.045 km
Convert the km to mm, then the units can be removed and the ratio found: 1 m = 1,000 mm 1 km = 1,000 m = 1,000 x 1,000 mm = 1,000,000 mm ⇒ 1 mm : 50 km → 1 mm : 50 x 1,000,000 mm → 1 mm : 50,000,000 mm → 1 : 50,000,000
4 km = 4000 metres. You decide which is greater.