Multiple Choice Questions on Pipes A and B can fill a cistern in 15 hours together But if these pipes operate separately A takes ........... for Mathematics - All Exams Preparation

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Multiple Choice Questions

Pipes A and B can fill a cistern in 15 hours together But if these pipes operate separately A takes ...........

Quant (SSC) Pipes&cistern
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    Pipes A and B can fill a cistern in 15 hours together. But if these pipes operate separately A takes 40 hours less than B to fill the tank. In how many hours the pipe A will fill the cistern working alone?

    60

    Incorrect Answer

    20

    Correct Answer

    40

    Incorrect Answer

    15

    Incorrect Answer
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    Explanation:

    Let A takes x hours,
    then B = (x+40) hours
    1/x + 1/(x+40) = 1/15
    Solve, x = 20
    Hence, option 2 is the correct answer.

    By: Amit Kumar
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