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    Question

    A tap can fill the tank in 18 hrs, but due to tank

    leakage the tank empties in 30 hours. What will be the time required to fill the tank by them together.
    A 40 hours Correct Answer Incorrect Answer
    B 45 hours Correct Answer Incorrect Answer
    C 55 hours Correct Answer Incorrect Answer
    D 35 hours Correct Answer Incorrect Answer
    E none of these Correct Answer Incorrect Answer

    Solution

    ATQ, we can say that Let the total capacity of the tank be taken as 90 units. Part of the tank filled by A in 1 hour = 5 units Part of the tank emptied by B in 1 hour = 3 units Part of the tank filled by A and B together in 1 hour = 2 units Required time = 90/2 = 45 hours

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