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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

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