At every hour exactly, for example 'the train will leave at 1pm or 2pm and so on - on the hour.
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An hour or an hour and fifteen minutes
If you mean 2/3 of an hour then there are 40 minutes
If you mean 2/3 of an hour then there are 40 minutes
I think you mean "What is 3rd of an hour in minutes?" 1 hour = 60 minutes 1/3 hour = 60/3 = 20 minutes
If you mean an expession such as "quarter of six," it means a quarter of an hour before six o'clock, or in other words, 5:45. A quarter of an hour is 15 minutes (1/4 of 60, the number of minutes in an hour). Two quarter-hours make half an hour.