How many seconds old will someone be at the very moment they turn 10 years old?

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Answer 1 · 2017-07-29T13:36:53

Either $315,532,800$ seconds or $315,618,800$ seconds, depending on the number of leap years, which can be $2 or 3$ during $10$ years.

We cannot give an absolute exact answer without knowing the date and year of birth, because of the effect of leap year.

Someone who is $10$ will have experienced 2 leap years for sure, and perhaps $3$ .

Let's ignore the leap years for now.....

To find the number of seconds in a year:

year $rarr$ days $rarr$ hours $rarr$ minutes $rarr$ seconds

$1 xx365 xx24xx60xx60 = 31,536,000$ seconds in one year.

Seconds in $10$ years: $315,360,000$

Seconds in one day: $24 xx60xx60 =86,000$ seconds

So if we include $2$ leap years:

$315,360,000 +2 x 86,000 = 315,532,800$ seconds

Including $3$ leap years gives: $315,618,800$ seconds