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There are 60 seconds in a minute, so a half minute would be 30 seconds. If you have a length of time in half minutes, multiply that by 30 to get seconds. For example, 20 half minutes = 20 x 30 seconds = 600 seconds
4 minutes 30 seconds
30 minutes = 1,800 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.