Pipe A can fill a pool in 9 hours. Pipe B is 50% more efficient than A, and pipe C is half as efficient as B. If all three are opened together, how long will the pool take to fill?

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Accepted Answer

210/13 h. A: 1/9; B: 1.5×1/9=1/6; C: 1/12. Sum =4+6+3/36=13/36 → 36/13=210/13 h. (3.6 h is A and B only.)

Pipe A can fill a pool in 9 hours. Pipe B is 50% more efficient than A, and pipe C is half as efficient as B. If all three are opened together, how long will the pool take to fill?

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