2/3 of 1hour and 30 mins
2/3 of hour is
(2/3) * 60 min = 2*60 / 3 = 120/3 = 40 min
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2/3 of 1hour and 30 mins
(2/3) * 30 min = 2*30 / 3 = 60 /3 = 20 min
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