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20.5 hours.
3.5 hours.
Four
4
It is 4 hours.
201/2 hours exactly.
830 930 1030 1130 1230 130 230 330 7 hours
1960
14 hours, and 30 minutes
It is 4 hours and 15 minutes.
4
1230 /7 = 175 weeks and a few days left over