72 years is equal to how many seconds?

Answer 1

(72 years) x (365.2422 days/year) x (24 hr/day) x (60 min/hr) x (60 sec/min) = 2,272,098,678 seconds

So 72 years is around 2 billion seconds.

If you want to figure it out on your own, make sure the units (like "days/year" and "min/hr") all cancel out except the one you want (seconds). For example:

(years)(days/year) -> "years" cancel, leaving "days"

So in the above, you have:

(years)(days/year)(days)(hr/day)(min/hr)(sec/min) -> all cancel except seconds.