Exactly 30 seconds
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210 seconds
30 minutes × 60 seconds = 1800 seconds in half an hour.
3.5 minutes is 210 seconds.
There are 60 seconds in a minute, so one and a half minutes would be 90 seconds. To convert seconds to minutes, you would divide by 60. Therefore, one and a half minutes is equal to 1.5 minutes or 1 minute and 30 seconds.
2 + 2.5 = 4.5 minutes = 270 seconds