1 hour = 60 minutes. You now have all the information required to answer the question.
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1 hour = 60 minutes so 21 hours = 60*21 =1260 minutes
2 hours 21 minutes 60+60+21=141
8 hours and 21 minutes
there are 3 hours and 21 minutes.
10 hours, 21 minutes ! To find this out divide the number by 60. So 621/60=10 hours, 21 minutes.