medium · GMAT Quant
An inlet pipe A can fill a tank in 12 hours, and a second inlet pipe B can fill the same tank in 18 hours. A drain valve C, if opened on a full tank, would empty it in 9 hours. All three are opened simultaneously on an empty tank and left running continuously.
How long will it take for the tank to become completely full?
- 7.2 hours
- 18 hours
- 24 hours
- 36 hours
- It will never fill
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