30 minutes
One hour.
They will last an hour or 60 minutes.Working it outTake the first pill when the doctor gives the pills to you, take the second pill 30 minutes after that, and the third pill 30 minutes later.
2 houers
An hour. For example: If you take one at 9:00, then 9:30, then 10:00 - that's one hour.
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
60 minutes. take one now, another in a half hour and another a half hour after that. a total of 60 minutes has transpired since you got the pills. it's supposed to be 90 minutes... why an hour?
One prolonged blast should be sounded every two minutes.
One prolonged blast should be sounded every two minutes.
One prolonged blast should be sounded every two minutes.
One prolonged blast should be sounded every two minutes.
one prolonged blast every 2 minutes
one prolonged blast