It depends on their orientation - back to front (in contact), back to front with a 30 cm gap, or head to toe.
* If the line were 1 cm units the line would be 1,100,000 km long. * The in contact line would then be (at 30 cm/person) 33,000,000 km long * The 30 cm gap line 66,000,000 km * The head to to toe line (80 cm/unit) 88,000,000 km
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Depends on the scale. One fifteenth of the length of the line from the Big Bang to the present?
2 billion seconds
4.5 billion seconds.
It would be 15.7cm long!
A billion is 1 followed by 9 zeroes, or 1,000,000,000. 27 billion billion billion would be 27 followed by 27 zeroes, or 27e27. In long form: 27,000,000,000,000,000,000,000,000,000 In words, twenty seven octillion.