6.4
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It's 1 centimeter long, and it represents 2 kilometers scale distance.
No, you cannot because kilometers are a unit of distance and grams are a unit of weight.
speed
The distance across Australia, travelling east-west is approximately 4000 kilometers
Any number that you like! A kilometre is a measure of distance and there may be any number of zeros in a distance. For example, the distance from my home to my children's infant school was 0.05 km. Now, my daughter lives 500 km away.