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60 seconds an 1 minute 60 minutes in 1 hour 30 minutes in half an hour 90 minutes in one and a half hours. So 90 minutes * 60 seconds = 5400 seconds
3.5 minutes = 60 + 60 + 60 + 30 = 210 seconds.
lets use an example. you are told you have half of a minute. you know there are 60 seconds in a minute. therefore half of 60 is? 60/2 (x1) If you are told you have 3/12 of a minute. 60/12, x3 is 15 seconds.
43200 seconds / 60 seconds in a minute / 60 minutes in an hour = 12 otherwise known as half a day
Acvtually it's quite easy to work out. 19 is half of 38, so what is half of 60?