0.4 minutes, or 2/5 minutes. 24 seconds doesn't make any minutes. It's 6 seconds less than half a minute. A minute is 60 seconds.
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There are: 1440/60 = 24 minutes in 1440 seconds.
5 hours 24 minutes is 19,440 seconds.
We already know how many seconds there are in 24 seconds (24), so all we need to calculate is the "15 minutes" part. 1 minute = 60 seconds 15 minutes = (15 x 60) = 900 seconds. Add the extra 24 seconds, total = 924 seconds.
24 x 60 = 1440 minutes x 60 = 86,400 seconds
89,943 seconds.