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    Question

    Pipe β€˜A’ can fill a tank in 20 hours while pipe

    β€˜B’ takes 32 hours to empty it. Pipe β€˜A’ is opened alone when the tank was empty and after 14 hours pipe β€˜B’ is also opened. In how much time will the tank get filled completely?
    A 32 hours Correct Answer Incorrect Answer
    B 33 hours Correct Answer Incorrect Answer
    C 30 hours Correct Answer Incorrect Answer
    D 35 hours Correct Answer Incorrect Answer

    Solution

    Let the total capacity of the tank be 160 units Efficiency of pipe β€˜A’ = 160/20 = 8 units/hour Efficiency of pipe β€˜B’ = 160/32 = 5 units/hour Tank filled in 14 hours = 14 Γ— 8 = 112 units Therefore, required time taken to fill the remaining tank = (160 – 112)/(8 – 5) = 16 hours Therefore, total time taken = 14 + 16 = 30 hours

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