2 hours, 40 minutes
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There are 150 minutes in total. To convert this into half hours, we need to divide by 30 (since there are 30 minutes in a half hour). Therefore, 150 minutes divided by 30 equals 5 half hours.
5 hours x 60 minutes/hour x 60 seconds/minute = 18000 seconds/5 hours. 20 minutes x 60 seconds/minute = 1200 seconds/20 minutes 18000 seconds/5 hours + 1200 seconds/20 minutes = 19200 seconds/5 hours 20 minutes.
5.5 = five and a half hours or 5 hours 30 minutes
It means half an hour or 30 minutes
20 kiloseconds = 20 000 seconds = 5 hours 33 minutes 20 seconds