Answer:
8.64 seconds
Explanation:
According to the question
[tex]10^{10}\ years=1\ day[/tex]
[tex]1\ year=\dfrac{1}{10^{10}}\ day[/tex]
Humans have lived for [tex]10^6[/tex] years
In one universe day
[tex]10^6\ years=10^6\times \dfrac{1}{10^{10}}=10^{-4}\ day[/tex]
In seconds
[tex]10^{-4}\times 24\times 60\times 60=8.64\ seconds[/tex]
In one universe day humans have lived for 8.64 seconds
