8 hr 40 min + 1 hr 45 min = 10 hr 25 min
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There are 60 minutes in one hour. Therefore, 40 minutes is equal to 2/3 hours, or two thirds of an hour.
since there are 60 minutes in one hour then 40 minutes is 40/60 = 2/3 hour = 0.667 hours, so 9 hours and 40 minutes is 9.667 hours
1 hour, 40 minutes.
(7.50 hours) + (10 minutes) = 7 hours 40 minutes.
3 hours 15 minutes minus 1 hour 35 minutes = 1 hour and 40 minutes