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An aqueous solution of methanol is to be distilled in a tray column. High pressure steam is available as a source of heat. For a given reflux ratio and overhead composition, two options are being explored; (i) a reboiler is used and (ii) no reboiler is used but steam is fed directly to the bottom of the column. As compared to option (i), in option (ii)
A machine can produce 10 units in 5 hours. Another machine can produce 5 units in 10 hours. Working together, how many units can they produce in 30 hours?
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