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

    Question

    Three workers P1, P2 and P3 got work from the

    contractor. In 30 days, ‘P1’ completed 30% of work. ‘P2’ is 20% less efficient than ‘P1’ but takes 5 days less than ‘P3’ to complete the work alone. Find the time taken by all three together to complete 33.4% of work.
    A 17 Correct Answer Incorrect Answer
    B 16 Correct Answer Incorrect Answer
    C 13 Correct Answer Incorrect Answer
    D 12.4 Correct Answer Incorrect Answer
    E 10 Correct Answer Incorrect Answer

    Solution

    Time taken by ‘P1’ to complete the work = 30/0.3 = 100 days
    Time taken by ‘P2’ to complete the work = 100/0.8 = 125 days
    Time taken by ‘P3’ to complete the work = 125 + 5 = 130 days
    Let the total work = 6500 units (LCM of 100, 125 and 130)
    Efficiency of ‘P1’ = 6500/100 = 65 units/day
    Efficiency of ‘P2’ = 6500/125 = 52 units/day
    Efficiency of ‘P3’ = 6500/130 = 50 units/day
    Required time taken = (0.334 × 6500)/167 = 13 days

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