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13 February, 17:44

There are three drains in a 6-meter-deep reservoir of water. To lower the water level by 2 meters it takes drain A 2 hours, drain B 3 hours, and drain C 4 hours. If all three drains are opened at once, how long will it take to empty the reservoir?

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  1. 13 February, 18:09
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    I think the answer would be b
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