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| 1 and 11/19 hours. In one
hour "A"
fills 1/2, "B"
fills 1/3, and "C"
empties 1/5 of the tank. Therefore, with all the pipes working
(1/2 + 1/3 -1/5) or (19/30) of the tank is filled in one hour.
Therefore with all pipes working (30/30) of the tank is filled
in (30/19) hours or 1 and 11/19 hours. |
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