1/30
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1 hour = 100% 1 minute in an hour = 1/60 therefore 30 seconds in an hour = 1/120
120 seconds = 2 minutes 120 seconds = 0.03 hour
30/60=1/2 1/2/60 =1/120 so it's 1/120. If 1 minute or 60seconds is 1/60 of an hour, so 30 seconds must be 1/120.
6 seconds 120 seconds or 1/20
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.