Dividing 4 hours 12 minutes by 3 gives 1 hour 24 minutes.
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192 minutes in hours is 3 hours and 12 minutes
60 minutes = 1 hour 196 divided by 60 = 3 hours and 16 minutes
Three hours and 12 minutes is 3.2 hours. 12 minutes is one fifth of an hour (60/12 = 5) and one fifth is 0.2.
0.4 of 8 hours = 0.4*8 = 3.2 hours = 3 hours 12 minutes
8 hours and 40 minutes -- or 8 2/3 hours to be exact. How do I know? 9 am to 12 pm (noon) is 3 hours. 12 pm (noon) to 5 : 40 pm is 5 hours and 40 minutes, or 5 2/3 hours. 3 + 5 2/3 = 8 2/3