It is half an hour because 30/60 = 1/2
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There are 60 minutes in an hour. Four minutes = 4/60 = 2/30 = 1/15.
There are 30 minutes in half an hour and 15 minutes in a quarter of an hour
One hour is 60 minutes so 30 minutes is one-half of an hour.
1/5 ---------- 20% No No. fifteen minutes = 1/4 one quarter of an hour 0r 25 % there are 60 minutes in one hour 30 minutes in 1/2 half an hour and 15 in a quarter of an hour.
1 hour is 60 minutes. 60 minutes + 30 minutes = 90 minutes