1/9th
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It is: 20/(60*60) = 1/180 of an hour
It is: 15/3600 = 1/240 in its lowest terms
There are 60 seconds in a minute. There are 60 minutes in an hour. Therefore, there are 60*60=3 600 seconds in a hour. There are 24 hours in a day. Therefore, there are 3 600*24=86 400 seconds in a day. Your number of seconds/the number of seconds in a day=1 468 800 seconds/86 400 seconds in a day=17 days.
Fraction . . . 400/1 Decimal . . . 400.000
45 sec / 1 hr = 45 sec / 3600 sec = 1/80