108,030 seconds.
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4.5hours*60minutes/hour*60seconds/minute = 1620 seconds
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
90 seconds
4500 seconds / 60 seconds in a minute = 75 minutes /60 minute in an hour = 1.25 hours
2 and a half hours is 90 seconds.