1 hour = 60 minutes, so
630/60 = 10.5 hours, or 10 hours 30 minutes
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630 minutes.
10 hours and 40 minutes.
There are 8.5 hours. * hours and 30 minutes
1 hour = 60 minutes 2 hours = 120 minutes 3 hours = 180 minutes . . . 10 hours = 600 minutes 10 hours + 30 minutes = 630 minutes
There are 60 seconds in one minute. Therefore, 10.5 minutes is equal to 10.5 x 60 = 630 seconds.