Divide seconds by 3,600. So, 15 seconds = 15 / 3,600 = 0.004167 hour
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15 seconds = 1/240 of an hour (0.004 hours) Divide 15 seconds by 60 seconds per minute, and then by 60 minutes per hour 15/3600 = 1/240
15 seconds = 15/60 minutes = 0.25 minutes = 0.25/60 hours = 0.004166... hours = 4.166... *10-3 hours
15 hours = 54,000 seconds.
To convert hours to seconds, multiply by 3600 (60 minutes multiplied by 60 seconds)
To convert hours to seconds, multiply by 3600.