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    Question

    If a tank can be filled by a tap in 15 hours, but due to

    an outlet, it actually takes 5 hours longer to fill the tank, find the duration in which the outlet alone would empty the tank?
    A 30 Correct Answer Incorrect Answer
    B 28 Correct Answer Incorrect Answer
    C 36 Correct Answer Incorrect Answer
    D 60 Correct Answer Incorrect Answer
    E 42 Correct Answer Incorrect Answer

    Solution

    Let tap ‘A’ fill the tank and tap ‘B’ empty the tank. Taking LCM of 15 and 20 = 60 Efficiency of A = 4 Efficiency of (A – B) = 3 Efficiency of B = 4 – 3 = 1 Tap B will empty the tank = 60/1 = 60 So, tap B will empty the tank in 60 hours.

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