1 hour = 60 minutes
1/2 hour = 30 minutes = 0.5 of an hour
5.5 hours = 5 hours 30 minutes
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24 hours = 1 day 55 hours = 55/24 = 2.29 days (2 dp)
Subtracting 55 minutes from 9 hours gives 8 hours, 5 minutes.
5 hours and 55 minutes is equal to 355 minutes.
(2 hours 55 minutes) + (4 hours 55 minutes) = 7 hours 50 minutes
There are: 55*60*60 = 198,000 seconds