Question

Convert 15 years to seconds

Answer 1

1 hour = 3600 s
1 day = 24 hours = 24 x 3600 = 86400 seconds

1 day ...... 86400 seconds
365 days ..... t seconds

t= 365 x 86400 /1 = 31536000

So, we have 31536000 seconds in 365 days. => 31536000 seconds = 1 year 

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1 year ........ 31536000 seconds 
15 years .......... z seconds 

z = 15 x 31536000 / 1 
z= 473040000 

So, 15 years = 473040000 seconds !!!!!! 
Done.