New RBI Grade B 2025 Notification will come Soon! Enroll Here

    Question

    Three pipe P1, P2 and P3 fill the tank in 15 hours, 10

    hours and 20 hours respectively. If all the three pipes opened together and pipe P2 & P1 are closed after three hours, then pipe P3 fill the remaining tank. Find the total time to fill whole tank.
    A 12 hours Correct Answer Incorrect Answer
    B 6 hours Correct Answer Incorrect Answer
    C 14 hours Correct Answer Incorrect Answer
    D 10 hours Correct Answer Incorrect Answer
    E 17 hours Correct Answer Incorrect Answer

    Solution

    Let the capacity of tank L.C.M. (15, 10, 20) = 60 units Efficiency of pipe P1 = 60/15 = 4 units/hour Efficiency of pipe P2 = 60/10 = 6 units/hour Efficiency of pipe P3 = 60/20 = 3 4 units/hour Tank filled by all the three in three hours = 13 × 3 = 39 units Remaining tank filled by pipe P3 = (60−39)/3 = 7 hours Total time = 3 + 7 = 10 hours

    Practice Next

    Relevant for Exams: