15 years = 131,487.192 hours.
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15 years = 131,487.2 hours.
15 hours = 54,000 seconds.
15 hours is 900 minutes.
7 hours and 15 minutes !
1 year = 365 day * 24 hours * 60 minutes * 60 seconds 1 year = 31536000 seconds for 15 years 15*1 years = 31536000*15 seconds 15 years = 473040000 seconds BY:- SAIFULLAH JAMALI INSTITUTE OF PHYSICS UNIVERSITY OF SINDH, PAKISTAN