13 minutes is 13/60 of one hour.
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There are 60 minutes in one hour, so 1 hour and 13 minutes is 73/60. It can also be written as 1 13/60.
To answer this you need to express the hour in minutes. This gives us consistent units. There are 60 minutes in an hour, so the question can be rewritten as "what fraction is 52 minutes of 60 minutes." This is 52/60. That can then be simplified to 13/15
One third of an hour is 20 minutes.
It is 39/60 which can be simplified, if required.
13 hours. There are 60 minutes in one hour, and 60 times 13 = 780.