there are 90 secs in 1 and 1/2 minutes
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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.
There are 270 seconds in 4 1/2 minutes. A minute is 60 seconds, so 4.5 x 60 = 270 seconds.
There are 60 seconds in one minute. Therefore, 90 minutes is equal to 90 x 60 = 5400 seconds.
One minute has 60 seconds. Do the math.
5400 seconds. ************************ 60 seconds = 1 minute 60 minutes = 1 hour so 1 and a half hours is 1.5x60x60= 5400 BUT I read question as 1 hour (60x60=3600seconds) plus half minute (0.5x60 = 30 seconds) so total is 3660 seconds