3.5 minutes is 210 seconds.
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210 seconds
210 seconds (60x3)+30
90 seconds. One minute is 60 seconds, 0.5 of a minute (half) is 30 seconds. 60 + 30 = 90
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
7 minutes and 40 seconds.