Multiple Choice Questions on A Sintex tank has two holes The first hole alone makes the tank empty in 15 minutes and second hole ........... for RRB(NTPC) Exam Preparation

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Multiple Choice Questions

A Sintex tank has two holes The first hole alone makes the tank empty in 15 minutes and second hole ...........

Quantitative Aptitude (RRB NTPC) Time and work
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    A Sintex tank has two holes. The first hole alone makes the tank empty in 15 minutes and second hole alone makes the tank empty in 25 minutes. If water leaks out at a constant rate, how long in minutes does it take if both the holes together empty the tank?

    3/8

    Incorrect Answer

    83/8

    Incorrect Answer

    91/4

    Incorrect Answer

    93/8

    Correct Answer
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    Explanation:
    Let the total capacity of tank=lcm(15,25)
    Tank emptied by fist hole in 1 minute=75/15=5lit.
    Tank emptied by second hole in 1 minute=75/25=3 lit.
    Tank emptied by both holes in 1minute =3+5=8lit.
    Time taken to empty whole tank by both
    holes together=75/8= 9 3/8

    By: Barka Mirza
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