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1 minute = 60 seconds
1 hour = 60 minutes
1 day = 24 hours
1 year = 365 days
21 years = (21 x 365 x 24 x 60 x 60) = 662,256,000.
Add 5 days for 5 leap years in 21 years: 5 days = (5 x 24 x 60 x 60) = 432,000, seconds
On his 21st birthday, at the exact hour, minute, and second that he was born, the 21-yr-old is (662,256,000 + 432,000)
= 662,688,000 seconds old.
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∙ 14y ago
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