4.5 × 60 = 270 seconds.
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2.208 minutes.
There are 270 seconds in 4 1/2 minutes. A minute is 60 seconds, so 4.5 x 60 = 270 seconds.
Thirty seconds is one half minute. Four minutes is the product of eight half minutes (8/2=4).
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