None.
A kilometre is a measure of length in 1-dimensional space while a square kilometre is a measure of area in 2-dimensional space. The two measure different things and, according to basic principles of dimensional analysis, any attempt at conversion from one to the other is fundamentally flawed.
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1012 or a trillion of them.
There are 1000 metres in one kilometre. Therefore, 7.2 kilometres is equal to 7.2 x 1000 = 7200 metres.
To figure out a question like this all the units we are dealing with need to be the same. So 1 kilometre and 0.3 kilometres need to be converted to metres - as we have to give the result in metres. Then we subtract one from the other. 1 kilometre = 1,000 metres 0.3 kilometres = 300 jmetres 1,000 - 300 = 700 So 0.3 kilometres is 700 metres short of a kilometre.
One kilometre is about 6/10ths of a mile. Therefore, theres about 1.75 kilometres in a mile.
A kilometre is a unit of distance. A square kilometre is a unit of area. The two units are therefore incompatible.