255
375 seconds.
There are 900 seconds in 15 minutes. (15 minutes is a quarter of an hour) You find this out by multiplying 60 (seconds in a minutes) by 15 (minutes).....HOPE THIS HELPED! :)
285 seconds.
18
1 minute = 60 seconds 1.25 minutes = 75 seconds.
A quarter hour = 15 minutes = 15*60 = 900 seconds.
135.
280 seconds.
There are 60 seconds in a minute then there are 4x60=240 seconds in 4 minutes
There are 45 minutes between 3:00 and a quarter to four.
There are: 5.25 times 60 = 315 seconds
Four quarters is 1. There are 60 minutes in 1 hour.