The number of min. in 30-day month can be calculated as follows:

There are 60 seconds in a minute. There are 60 minutes in an hour. There are 24 hours a day. There is 86400 seconds per day (24 hours). There are 168 hours per week (7 days). There are 720 hours in 30 days. 86,400 seconds divided by 60 seconds is 1440 seconds. 1440 seconds times 30 days is 43,200 minutes.

That gives us the answer.. 43,200 minutes are in 30 days.

131400 hope it helps.

the awnser is group 12