Divide the number of seconds by 60.
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40 minutes = 2,400 seconds (multiply minutes by 60 to get seconds).
2400 seconds
There are .66 minutes in 40 seconds
19 minutes 30 seconds minus 12 minutes 40 seconds = 6.833 minutes OR 6 minutes 50 seconds.
When you add 5 minutes and 40 seconds to 8 minutes and 50 seconds, the total is 14 minutes and 30 seconds.