3/4
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There are 60 seconds in a min. and 60 mins. in an hour = 3600 seconds in an hour. 19 seconds is therefore 19/3600 of and hour.
It is: 60 seconds = 1 minute which is 1/60 of an hour
1/5 of an hour.
1/30
1 hour = 100% 1 minute in an hour = 1/60 therefore 30 seconds in an hour = 1/120