Multiple Choice Questions on Two pipes fill the tank in 12min and 15min There is also a waste pipe in the tank When all the three........... for Mathematics - All Exams Preparation

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Multiple Choice Questions

Two pipes fill the tank in 12min and 15min There is also a waste pipe in the tank When all the three...........

Quant (SSC) Pipes&cistern
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    Two pipes fill the tank in 12min and 15min.There is also a waste pipe in the tank.When all the three are opened,the empty tank is full in 20 min.How long will the waste pipe take to empty the tank ?

    10 min

    Correct Answer

    20 min

    Incorrect Answer

    30 min

    Incorrect Answer

    35 min

    Incorrect Answer
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    Explanation:

    (1/20) –((1/12)+(1/15))
    = (1/20) – [(5+4)/60]
    = (3-9)/60 = -6/60
    = -1/10= 10 min
    Hence, option 1 is the correct answer.

    By: Amit Kumar
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