There are 1000 meters in a kilometer, and there are 100 centimeters in a meter.
150 cm is 1.5 meters, which is 1.5/1000. That simplifies too 3/2000.
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150 cm/1 km = 150/100,000 = 3/2000
Since one km = 1000 m and one cm = 0.01 meter, 150 cm = 150(0.01 m)/[1000 (m/km)], or (150 X 10-2/1000) km = 1.50 X 10-3 km.
2 cm = 150 km 4 cm = 300 km
First find how many km per cm by dividing 45 by 3 = 15. Next multipy 15 X 10 = 150. 10 cm = 150 km
100 cm = 1/1000 kilometre or 10-3 km