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Railways R.R.C. (Hajipur) Solved Paper Held on 1st Shift 30-11-2014

  • question_answer
    Two pipes A and B can fill a tank in 15 minutes and 20 minutes respectively. Both the pipes are opened together. But, after 4 minutes, pipe A is turned off. What is the total time required to fill the tank?

    A) 10 min. 20 sec.  

    B) 11 min. 45 sec.

    C) 12 min. 30 sec.  

    D) 14 min. 40 sec.

    Correct Answer: D

    Solution :

    Suppose the total time required to fill the tank is x minutes. Then,    \[\frac{4}{15}+\frac{x}{20}=1\]             \[\frac{x}{20}=\frac{11}{15}\]             \[x=\frac{11\times 20}{15}\]             \[=14\,\,\min .40\,\,sec.\]


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