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    Question

    Tap A is 100% more efficient than tap B. Both the taps

    together can fill the tank in 10 hours. Find the time taken by tap C, which is 25% more efficient than tap B, to fill the tank alone.
    A 27 hrs Correct Answer Incorrect Answer
    B 24 hrs Correct Answer Incorrect Answer
    C 30 hrs Correct Answer Incorrect Answer
    D 18 hrs Correct Answer Incorrect Answer

    Solution

    Let, time taken by tap B to fill the tank be x hours,
    So, time taken by tap A to fill the tank = x/2 hours According to question,
    1/x + 1/(x/2) = 1/10
    1/x + 2/x = 1/10
    x = 30 So, time taken by tap C to fill the tank = 30/1.25 = 24 hours

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