It is 10/36000, which can be simplified, if required.
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An hour has 3600 seconds. 10 seconds is 1/360 of an hour.
60mins 40sec is 6.6667 mins. 6.667/60 is 10/90 or 1/9 of an hour.
2/5
It is: 20/(60*60) = 1/180 of an hour
1/9th