Question

Humans have existed for about 106 years, whereas the universe is about 1010 years old. If the age of the universe is defined as 1 "universe day," where a universe day consists of "universe seconds" as a normal day consists of normal seconds, how many universe seconds have humans existed?

Answer 1

Answer:

8.64 seconds

Explanation:

According to the question

$10^{10}\ years=1\ day$

$1\ year=\dfrac{1}{10^{10}}\ day$

Humans have lived for $10^6$ years

In one universe day

$10^6\ years=10^6\times \dfrac{1}{10^{10}}=10^{-4}\ day$

In seconds

$10^{-4}\times 24\times 60\times 60=8.64\ seconds$

In one universe day humans have lived for 8.64 seconds