It is: 15/60 or 1/4 simplified
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60min = 1 hour so 135 min = 2hrs 15min
The fraction is 1.
A minute is 1/60 of an hour
30 minutes is half an hour (1/2 as a fraction. 0.5 as a decimal). Note, there are 60 minutes in 1 hour.
5/60 = 1/12th of an hour