4 hours 40 minutes
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280 minutes ÷ 60 minutes/hour = 4.667 hours (4 hours and 40 minutes)
60 minutes = 1 hour so 280 min = 280/60 = 4.66... hours.
there are 280 minutes in 3 hours and 30 minutes * * * * * Not anywhere near the correct answer which is 210 minutes.
280 = 60 + 60 + 60 + 60 + 40 4 hours 40 minutes
1 hour and 20 minutes = 80 minutes 2 hours and 80 minutes = 200 minutes 280 minutes x 2 = 560 minutes 560 minutes x 1h/60min = 9 1/3 hours = 9 hours and 20 minutes