1.

Pipes A and B can fill a tank in 16 hours and 24 hours, respectively, whereas pipe C can empty the full tank in 40 hours. All three pipes are opened together, but pipe A is closed after 10 hours. After how many hours will the remaining part of the tank be filled?

A. 10
B. 20
C. \(12 \dfrac{1}{2}\)
D. \(15 \dfrac{1}{2}\)
Answer» D. \(15 \dfrac{1}{2}\)


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