None. An hour is 60 minutes.
Answer:
0.85 Hours, 85% of an hour or 51/60 of an hour.
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3 hours and 51 minutes
51/2 hours is 330 minutes.
171 minutes * 1 hours/60 minutes = 2.85 hours (or 2 hours and 51 minutes).
It is: 1 hour and 51 minutes
4.15 hours is 4 hours and 9 minutes. 3.85 hours is 3 hours and 51 minutes. The difference is 24 minutes.