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7 July, 14:04

Three ventilation fans, each working alone, can clear the smoke out of a room in 12 hours, 16 hours, and 24 hours respectively. How long would it take to clear out the smoke in the room if all three fans are used?

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  1. 7 July, 15:44
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    (use at own risk) either 16 17 or 17.3 hours
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