Three hours
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400 ÷ 60 = 6 hours 40 minutes
60 minutes = 1 hour so 400 min = 400/60 = 6.66... hours. Simple!
6 hours 40 minutes
Each 60 minutes = 1 hour 400 minutes = (400 / 60) = 6 and 40/60 hours = 6hours 40minutes or 6 and 2/3 hours
about 400.