60 seconds are in a minute.
180 seconds are in 3 minutes.
210 seconds are 3 minutes and 30 seconds.
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There are 210 seconds in 3.5 minutes, since there are 60 seconds in a minutes and 60 x 3.5 = 210
3 and a half minutes = 210 seconds.
The answer is 210 seconds because:Keyhalf a minute=30 sec Method:a minute=6o seconds 60x3= 180+30=2103.5 minutes * 60 = 210 seconds
3 Hours and 30 Minutes=210 minutes=12600 seconds
3.5 minutes = 60 + 60 + 60 + 30 = 210 seconds.