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Railways Sample Paper RRB (Assistant Loco Pilot & Technician) Sample Test Paper-1

  • question_answer
    Two pipes A and B can separately fill a cistern in 120 minutes and 150 minutes respectively. There is a third pipe n the bottom of the cistern to empty it. If all the three pipes are simultaneously opened then the cistern is full in 100 minutes. In how much time the third pipe alone empty the cistern?

    A)  200 min                       

    B)  100 min

    C)  110 min           

    D)       120 min

    Correct Answer: A

    Solution :

     Work done by the third pipe in 1 min \[=\frac{1}{100}-\frac{1}{120}+\frac{1}{150}\] \[=\frac{1}{100}-\frac{3}{200}=\frac{1}{200}\] The third pipe alone can empty the cistern in 200 min


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