the question gives us a conversion factor but we need more:
1 year= 365 days
1 day= 24 hours
1 hour= 60 min
1 min= 60 seconds
[tex]2500 years ( \frac{365 days}{1 year} ) ( \frac{24 hours}{1 day} ) ( \frac{60 minutes}{1 hour} ) ( \frac{60 seconds}{1 minute} )= 7.9x10^{10} seconds[/tex]
