1/20
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45 minutes is 3/4 of an hour
I think you mean "What is 3rd of an hour in minutes?" 1 hour = 60 minutes 1/3 hour = 60/3 = 20 minutes
1/3 of an hour is 20 minutes.
An hour is 60 minutes, so 40 minutes is 2/3 of an hour.
3 hours 15 minutes minus 1 hour 35 minutes = 1 hour and 40 minutes