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.
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192 minutes in hours is 3 hours and 12 minutes
Dividing 4 hours 12 minutes by 3 gives 1 hour 24 minutes.
The hard part is the 12 minutes. 12 mins is what fraction of 1 hour? 60 minutes in an hour so 12 min is 12/60 simplify the fraction (12 and 60 are both multiples of 12 so divide numerator and denominatro by 12. 12/60 = 1/5 so 12 minutes is 1/5 of an hour for a decimal answer, you need to express 1/5 in tenths 1/5 = 2/10 (multiply numerator and denominator by 2) 2/10 is 0.2 so 3 hours 12 min is 3hours and 0.2 hours = 3.2 hours
Expressed as a decimal fraction, this is equal to 3.3 recurring (that is, 3.333..) hours.
8 hours and 20 minutes = 8 + 20/60 hours = 81/3 hours = 8.33... recurring hours.