15 seconds = 15/60 minutes = 0.25 minutes
= 0.25/60 hours = 0.004166... hours
= 4.166... *10-3 hours
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Note that 1 hour = 3600 seconds. Then, 6 hours = 21600.0 seconds. Shift 4 decimal places to the left, so the exponent for base 10 is 4. Therefore, we have 2.16 x 104 seconds.
To convert hours to seconds, multiply by 3600 (60 minutes multiplied by 60 seconds)
To convert hours to seconds, multiply by 3600.
60x60x2 =7200 seconds
12240