Multiple Choice Questions on Two pipes can fill a tank in 20 and 24 minutes respectively and a waste pipe can empty 3 gallons per........... for Mathematics - All Exams Preparation

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Multiple Choice Questions

Two pipes can fill a tank in 20 and 24 minutes respectively and a waste pipe can empty 3 gallons per...........

Quantitative Aptitude ( CCS) Pipes&cistern
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    Two pipes can fill a tank in 20 and 24 minutes respectively and a waste pipe can empty 3 gallons per minute. All the three pipes working together can fill the tank in 15 minutes. The capacity of the tank is

    60 gallons

    Incorrect Answer

    100 gallons

    Incorrect Answer

    120 gallons

    Correct Answer

    180 gallons

    Incorrect Answer

    200 gallons

    Incorrect Answer
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    Explanation:
    Work done by the waste pipe in 1 minute = 1/ - 1/ + 1/
    15 20 24
        = 1/ - 11/
    15 120
        = -  1/ .    [-ve sign means emptying]
    40
     Volume of 1/ part = 3 gallons.
    40

    Volume of whole = (3 x 40) gallons = 120 gallons.

    Hence, option 3 is the correct answer.

    By: Amit Kumar
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