New Enroll in RBI Grade B New Batch - Starts on May 21

    Question

    Pipe A and Pipe B together can fill the tank in 25

    hours. The capacity of the pipe A is 20% of the capacity of the pipe B. How much time will pipe B alone take to fill the tank.
    A 40 hours Correct Answer Incorrect Answer
    B 25 hours Correct Answer Incorrect Answer
    C 28 hours Correct Answer Incorrect Answer
    D 30 hours Correct Answer Incorrect Answer

    Solution

    Capacity of the pipe A = 20/100 × Pipe B Pipe A /Pipe B = 1/5 Efficiency of pipe A = 1 units Efficiency of pipe B = 5 units Total work = 25 × (1+5) = 150 units Time taken by Pipe B to fill the tank = 150/5 = 30 hours

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