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
Sign up free to see the explanation and track your rank →
More GMAT Quant practice
- Including both endpoints, how many distinct integer price points are in this range?
- Which of the following expressions must result in a positive value?
- Which property of arithmetic justifies that first step?
- Which of the following must also be an even integer?
- Which of the following inequalities correctly represents this range?
- Which of the following includes the number 0?
- How many unique meal combinations can a customer create?
- What is the probability that the lightbulb is functional?