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30 minutes is 1/6th of 3 hours, so the ratio of 30 minutes to 3 hours is 1:6
9/2
18:1
160 minutes 2 & 2/3 hours = 2 X 3/3 + 2/3 = 6/3 + 2/3 = 8/3 hours 60 minutes/hour X 8/3 hours = 480 minutes/3 (the hours cancel each other out) = 160 minutes
45 minutes is 3/4 of an hour....and would be 3/32 of 8 hours