Timework3
- Option : C
- Explanation : Let pipe B alone take b hours longer than if both A and B were open. 8 = √(4 × x) ⇒ 64 = 4 × x ⇒ x = 16 hours. Alternatively Part filled if both A and B are open = 1/8 Part filled if only A is open = 1/12 ∴ Part filled if only B is open = (1/8) - (1/12) = 1/24 ∴ B alone would take 24 hours, i.e., B alone would take 24 - 8 = 16 hours longer to fill the tank.
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