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
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15 seconds = 15/60 minutes = 0.25 minutes = 0.25/60 hours = 0.004166... hours = 4.166... *10-3 hours
Divide seconds by 3,600. So, 15 seconds = 15 / 3,600 = 0.004167 hour
15 hours = 54,000 seconds.
17 hours 15 minutes is 62,100 seconds.
Convert 900 seconds to minutes by dividing 900 by 60. That gives you 15 minutes. Divide 250 by 60 to give you hours and minutes. That gives you 4 hours and 10 minutes. Add the previous 15 minutes and you get 4 hours and 25 minutes