- 04/30/2019 at 3:08 pm #730963EduGorillaKeymasterSelect Question Language :
Pipes A, B and C can fill a cistern in 6 hr, 12 hr and 18 hr, respectively. Another pipe D can empty it in 15 hr. In which of the following cases will the tank be filled in the least time?
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- If B alone is opened.
- If A and D are opened together.
- If A, B and D are opened.
- If B, C and D are opened.
- If A, C and D are opened.
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