1.5 hours is one hour and 30 minutes.
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54,000 seconds equals 900 minutes or 15 hours.
1.11 hours
2 hours
15 hours 20 minutes(920 divided by 60(minutes to an hour) equals 15.33333, 15 hours and a third; a third of an hour is 20 min, 15 hours and 20 minutes.)
3.66... hours