1/240
This is achieved as firstly one minute is 1/60 of an hour.
As the are 4 lots of 15 seconds in a minute, you multiply 60 by 4 (60x4) which is 240.
Therefore 15 seconds as a fraction of 1 hour is 1/240
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1/5 of an hour.
It is: 60 seconds = 1 minute which is 1/60 of an hour
1 hour = 100% 1 minute in an hour = 1/60 therefore 30 seconds in an hour = 1/120
1 hour = 3600 seconds which means that 1 second = 1/3600 hour Hence 15 seconds = 15/3600 hour = 5/1200 = 1/240 hour
1/30