30 minutes = 1/2 hour
(30 minutes)/(1 hour) = 1/2
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1/30 of an hour is 2 minutes.
15 minutes. One hour is 60 minutes, so half (1/2) an hour would be 30 minutes, and a quarter (1/4) hour 15 minutes.
30 minutes.
30 minutes have past if it's half past the hours. As a side effect 30 minutes is left till the hour ends if it's half past the hour.
You need to make it an expression of something, such as an hour. then divide minutes by 60 to get a decimal of an hour