Railways Sample Paper RRB (Assistant Loco Pilot & Technician) Sample Test Paper-4

  • question_answer
    A and B are two taps which can fill a tank individually in 10 minutes and 20 minutes respectively. However, there is a leakage at the bottom which can empty a filled tank in 40 minutes. If the tank is empty initially, how much time will both the taps take to fill the tank (leakage is still there)?

    A)  8 minutes                     

    B)  7 minutes

    C)  10 minutes        

    D)       15 minutes

    Correct Answer: A

    Solution :

     Part of the tank filled in 1 minute           \[=\frac{1}{10}+\frac{1}{20}-\frac{1}{40}\]            \[=\frac{4+2-1}{40}=\frac{5}{40}=\frac{1}{8}\] \[\therefore \] Hence, the tank will be filled in 8 minutes.

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