3 1/2 hours.
30 minutes = 30/60 = 3/6 = 1/2 hours
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you put the highest number at the top and put the lowest number at the bottom, then that is a mixed number
since there are 60 minutes in one hour then 40 minutes is 40/60 = 2/3 hour = 0.667 hours, so 9 hours and 40 minutes is 9.667 hours
9 3/10
17 and 6/10
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