11.
First of all, lets put it into minutes. There are 60 seconds in a minute.
39600 / 60 = 660 minutes. Now, lets put it into hours. There are 60 minutes in an hour.
660 / 60 = 11 hours
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18,000 seconds is five hours.
3600 seconds is equal to one hour.
12000 seconds is equal to 200 minutes or 3 hours and 20 minutes.
12.5 hours.
3,600 seconds = 1 hour600,000 seconds = 1662/3 hours