There are: 5.25 times 60 = 315 seconds
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One minute is 60 seconds, so a quarter of that is ¼ x 60 = 15 seconds.
There are 15 minutes in a quarter hour.
One and one-quarter hours is equal to 75 minutes.
One quarter-hour is 15 minutes.
The answer will depend on 19 what: seconds, minutes, hours, days etc.