It refers to an even which occurs at the frequency of once every 30 minutes and that the times of occurrence are on the whole hour and at 30 minutes (half an hour) past the hour.
The first part of the sentence gives the frequency (every 30 minutes) and the second gives the phase shift. The latter is to distinguish its timing from an event which takes place every 30 minutes but at 10 minutes and 40 minutes past each hour
30 minutes i guess theres only 30 minutes in an half-an-hour.
A clock that gain 30 second every hour will gain how many minutes in a day?
There are 60 minutes in 1 hour. So 30 minutes is half an hour.
30 minutes = 1/2 hour(30 minutes)/(1 hour) = 1/2
0.50 of an hour is 30 minutes.
There are 30 minutes in half an hour and 15 minutes in a quarter of an hour
1/30 of an hour is 2 minutes.
One hour is 60 minutes so 30 minutes is one-half of an hour.
If 1 pill must be taken every 30 minutes, then 3 pills would have been taken in the span of 1 hour and 30 minutes.
1 hour is 60 minutes. 60 minutes + 30 minutes = 90 minutes
1/2 of an hour. 30 minutes.
90 min are in a hour and a half90since an hour is 60 minutes and a half hour is half that (30) you just do a simple addition for your answer60+30=90 minutesThe number of mintues in a half hour are 30 minutes because a full hour is 60 minutes and if you divide it in to 2's u get 30 min!