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# 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?   ### Another question on Mathematics Mathematics, 21.06.2019 15:30
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Will mark determine whether the conjecture is true or false. give a counterexample for any false conjecture. given: points r, s, and t conjecture: r, s, and t are coplanar. a) false; the points do not have to be in a straight line. b) true c) false; the points to not have to form right angles. d) false; one point may not be between the other two.
Three ventilation fans, each working alone, can clear the smoke out of a room in 12 hours, 16 hours,...
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